

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




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

Table of n, a(n) for n=1..5.
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
Adjacent sequences: A198858 A198859 A198860 * A198862 A198863 A198864


KEYWORD

nonn,fini,full


AUTHOR

Geoffrey Critzer, Oct 30 2011


STATUS

approved



