Steven Dutch, Professor Emeritus, Natural and Applied Sciences,
University of Wisconsin - Green Bay
A polyhedron can be represented as a graph, and the effort on enumerating graphs in mathematics has been enormous because graphs apply to networks of all kinds. Thus, the number of polyhedra of each type is known exactly up through beyond 10 faces. The results are tabulated below.
Number of Faces | Number of polyhedra | N(f)/n(f-1) |
---|---|---|
4 | 1 | ---- |
5 | 2 | 2 |
6 | 7 | 3.5 |
7 | 34 | 4.9 |
8 | 257 | 7.6 |
9 | 2606 | 10.1 |
10 | 32300 | 12.4 |
11 | 440,564 | 13.6 |
12 | 6,384,634 | 14.5 |
13 | 96,262,938 | 15.1 |
14 | 1,496,225,352 | 15.5 |
15 | 23,833,988,129 | 15.9 |
16 | 387,591,510,244 | 16.3 |
17 | 6,415,851,530,241 | 16.6 |
18 | 107,854,282,197,058 | 16.8 |
Beyond 10 faces, there are only formulas for estimating the number. The values are from The Online Encyclopedia of Integer Sequences ID Number: A000944. Surprisingly enough, the increase doesn't keep accelerating but levels off. The increase factor from adding a face seems to converge to about 17. Extrapolating to 20 faces, it would take about 30 million years to view them all at movie speed (32 per second).
Plantri is a graph generating program by Gunnar Brinkmann of the University
of Ghent and Brendan McKay of the Australian National University. It is very
fast and is claimed to be able to generate over a million graphs per second.
It's not clear how many of the counts above are known exactly and which are
approximated by a formula, but plantri could easily tally the results up to
16 faces. The program downloads as a C program and must be compiled to run.
A compiled version (plantri.exe) is available at http://www.squaring.net./downloads/
These tables were generated using plantri.exe. A list of graphs (equivalent
to face adjacency lists) was created, then sorted by numbers of faces. Symbol
refers to the number of faces of each type. Thus 33334456 means four triangles,
three quadrilaterals, and one each pentagon and hexagon. Ntypes lists the number
of topologically distinct polyhedra for each type.
Vertices | Edges | Symbol | Ntypes |
7 | 13 | 33333344 | 9 |
8 | 14 | 33333337 | 1 |
8 | 14 | 33333346 | 2 |
8 | 14 | 33333355 | 3 |
8 | 14 | 33333445 | 19 |
8 | 14 | 33334444 | 17 |
9 | 15 | 33333447 | 2 |
9 | 15 | 33333456 | 6 |
9 | 15 | 33333555 | 3 |
9 | 15 | 33334446 | 11 |
9 | 15 | 33334455 | 25 |
9 | 15 | 33344445 | 21 |
9 | 15 | 33444444 | 6 |
10 | 16 | 33334457 | 4 |
10 | 16 | 33334466 | 4 |
10 | 16 | 33334556 | 11 |
10 | 16 | 33335555 | 3 |
10 | 16 | 33344447 | 2 |
10 | 16 | 33344456 | 15 |
10 | 16 | 33344555 | 13 |
10 | 16 | 33444446 | 5 |
10 | 16 | 33444455 | 16 |
10 | 16 | 34444445 | 2 |
10 | 16 | 44444444 | 1 |
11 | 17 | 33335557 | 1 |
11 | 17 | 33335566 | 2 |
11 | 17 | 33344467 | 2 |
11 | 17 | 33344557 | 3 |
11 | 17 | 33344566 | 6 |
11 | 17 | 33345556 | 4 |
11 | 17 | 33444457 | 1 |
11 | 17 | 33444466 | 2 |
11 | 17 | 33444556 | 8 |
11 | 17 | 33445555 | 4 |
11 | 17 | 34444456 | 2 |
11 | 17 | 34444555 | 2 |
11 | 17 | 44444455 | 1 |
12 | 18 | 33336666 | 1 |
12 | 18 | 33345567 | 1 |
12 | 18 | 33345666 | 1 |
12 | 18 | 33444477 | 1 |
12 | 18 | 33444567 | 1 |
12 | 18 | 33445557 | 1 |
12 | 18 | 33445566 | 2 |
12 | 18 | 33455556 | 1 |
12 | 18 | 33555555 | 1 |
12 | 18 | 34444566 | 1 |
12 | 18 | 34445556 | 1 |
12 | 18 | 44444466 | 1 |
Vertices | Edges | Symbol | Ntypes |
7 | 14 | 333333334 | 8 |
8 | 15 | 333333336 | 3 |
8 | 15 | 333333345 | 24 |
8 | 15 | 333333444 | 47 |
9 | 16 | 333333338 | 1 |
9 | 16 | 333333347 | 3 |
9 | 16 | 333333356 | 6 |
9 | 16 | 333333446 | 38 |
9 | 16 | 333333455 | 50 |
9 | 16 | 333334445 | 143 |
9 | 16 | 333344444 | 55 |
10 | 17 | 333333448 | 3 |
10 | 17 | 333333457 | 10 |
10 | 17 | 333333466 | 9 |
10 | 17 | 333333556 | 14 |
10 | 17 | 333334447 | 20 |
10 | 17 | 333334456 | 125 |
10 | 17 | 333334555 | 64 |
10 | 17 | 333344446 | 73 |
10 | 17 | 333344455 | 198 |
10 | 17 | 333444445 | 103 |
10 | 17 | 334444444 | 14 |
11 | 18 | 333334458 | 6 |
11 | 18 | 333334467 | 16 |
11 | 18 | 333334557 | 24 |
11 | 18 | 333334566 | 35 |
11 | 18 | 333335556 | 22 |
11 | 18 | 333344448 | 5 |
11 | 18 | 333344457 | 52 |
11 | 18 | 333344466 | 43 |
11 | 18 | 333344556 | 164 |
11 | 18 | 333345555 | 35 |
11 | 18 | 333444447 | 15 |
11 | 18 | 333444456 | 134 |
11 | 18 | 333444555 | 124 |
11 | 18 | 334444446 | 17 |
11 | 18 | 334444455 | 66 |
11 | 18 | 344444445 | 9 |
11 | 18 | 444444444 | 1 |
12 | 19 | 333335558 | 2 |
12 | 19 | 333335567 | 8 |
12 | 19 | 333335666 | 5 |
12 | 19 | 333344468 | 6 |
12 | 19 | 333344477 | 6 |
12 | 19 | 333344558 | 9 |
12 | 19 | 333344567 | 43 |
12 | 19 | 333344666 | 13 |
12 | 19 | 333345557 | 19 |
12 | 19 | 333345566 | 43 |
12 | 19 | 333355556 | 8 |
12 | 19 | 333444458 | 6 |
12 | 19 | 333444467 | 21 |
12 | 19 | 333444557 | 48 |
12 | 19 | 333444566 | 66 |
12 | 19 | 333445556 | 80 |
12 | 19 | 333455555 | 11 |
12 | 19 | 334444448 | 1 |
12 | 19 | 334444457 | 15 |
12 | 19 | 334444466 | 15 |
12 | 19 | 334444556 | 72 |
12 | 19 | 334445555 | 31 |
12 | 19 | 344444447 | 1 |
12 | 19 | 344444456 | 10 |
12 | 19 | 344444555 | 15 |
12 | 19 | 444444446 | 1 |
12 | 19 | 444444455 | 3 |
13 | 20 | 333336667 | 1 |
13 | 20 | 333345568 | 4 |
13 | 20 | 333345577 | 4 |
13 | 20 | 333345667 | 11 |
13 | 20 | 333346666 | 2 |
13 | 20 | 333355558 | 1 |
13 | 20 | 333355567 | 3 |
13 | 20 | 333355666 | 2 |
13 | 20 | 333444478 | 3 |
13 | 20 | 333444568 | 7 |
13 | 20 | 333444577 | 8 |
13 | 20 | 333444667 | 6 |
13 | 20 | 333445558 | 5 |
13 | 20 | 333445567 | 29 |
13 | 20 | 333445666 | 13 |
13 | 20 | 333455557 | 5 |
13 | 20 | 333455566 | 9 |
13 | 20 | 333555556 | 4 |
13 | 20 | 334444468 | 1 |
13 | 20 | 334444477 | 2 |
13 | 20 | 334444558 | 3 |
13 | 20 | 334444567 | 14 |
13 | 20 | 334444666 | 4 |
13 | 20 | 334445557 | 12 |
13 | 20 | 334445566 | 25 |
13 | 20 | 334455556 | 13 |
13 | 20 | 334555555 | 1 |
13 | 20 | 344444467 | 2 |
13 | 20 | 344444557 | 3 |
13 | 20 | 344444566 | 6 |
13 | 20 | 344445556 | 9 |
13 | 20 | 344455555 | 3 |
13 | 20 | 444444556 | 2 |
13 | 20 | 444445555 | 2 |
14 | 21 | 333346677 | 1 |
14 | 21 | 333355668 | 1 |
14 | 21 | 333355677 | 1 |
14 | 21 | 333445578 | 2 |
14 | 21 | 333445668 | 2 |
14 | 21 | 333445677 | 2 |
14 | 21 | 333446667 | 2 |
14 | 21 | 333455568 | 1 |
14 | 21 | 333455577 | 1 |
14 | 21 | 333455667 | 2 |
14 | 21 | 333555666 | 2 |
14 | 21 | 334444488 | 1 |
14 | 21 | 334444578 | 1 |
14 | 21 | 334444668 | 1 |
14 | 21 | 334445568 | 2 |
14 | 21 | 334445577 | 2 |
14 | 21 | 334445667 | 3 |
14 | 21 | 334446666 | 1 |
14 | 21 | 334455558 | 1 |
14 | 21 | 334455567 | 3 |
14 | 21 | 334455666 | 3 |
14 | 21 | 334555557 | 1 |
14 | 21 | 334555566 | 2 |
14 | 21 | 344444577 | 1 |
14 | 21 | 344445567 | 3 |
14 | 21 | 344445666 | 1 |
14 | 21 | 344455566 | 1 |
14 | 21 | 344555556 | 1 |
14 | 21 | 444444477 | 1 |
14 | 21 | 444444666 | 1 |
14 | 21 | 444445566 | 1 |
14 | 21 | 444455556 | 1 |
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Created 23 Sep 1997, Last Update 31 May 2020