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A198861 The number of ways to paint the faces of the five Platonic solids using exactly n colors where n is the number of faces of each solid. 3
2, 30, 1680, 7983360, 40548366802944000 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Let G, the group of rotations in 3 dimensional space act on the set of n! paintings of each Platonic solid having n faces. There are n! fixed points in the action table since the only element in G that leaves a painting fixed is the identity element. The order of G is A098427/2. So by Burnside's Lemma a(n)=n!/|G|.
LINKS
David Broughton's Puzzles & Programs, Colouring The Platonic Solids
FORMULA
a(n) = A053016(n)!/(2*A063722(n)) (see link). - Michel Marcus, Aug 24 2014
PROG
(PARI) lista() = {ve = [6, 12, 12, 30, 30 ]; vf = [4, 6, 8, 12, 20 ]; for (i=1, 5, nb = vf[i]!/(2*ve[i]); print1(nb, ", "); ); } \\ Michel Marcus, Aug 25 2014
CROSSREFS
Cf. A053016 (number of faces), A063722 (number of edges).
Sequence in context: A132104 A208093 A144501 * A162841 A158260 A099800
KEYWORD
nonn,fini,full
AUTHOR
Geoffrey Critzer, Oct 30 2011
STATUS
approved

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Last modified May 19 11:03 EDT 2024. Contains 372683 sequences. (Running on oeis4.)