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Search: id:A054472
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A054472 Number of ways to color faces of a icosahedron using at most n colors. +0
1
0, 1, 17824, 58130055, 18325477888, 1589459765875, 60935989677984, 1329871177501573, 19215358684143616, 202627758536996445, 1666666669200004000, 11212499922098481787, 63895999889747261952 (list; graph; listen)
OFFSET

0,3

LINKS

Eric Weisstein's World of Mathematics, Polyhedron Coloring

FORMULA

a(n)=(1/60)*(n^20+15*n^10+20*n^8+24*n^4).

CROSSREFS

Cf. A006008, A047780, A000543, A000545.

Sequence in context: A035923 A137878 A133540 this_sequence A106769 A025029 A030331

Adjacent sequences: A054469 A054470 A054471 this_sequence A054473 A054474 A054475

KEYWORD

easy,nonn,nice

AUTHOR

Vladeta Jovovic (vladeta(AT)Eunet.yu), May 20 2000

EXTENSIONS

More terms from James A. Sellers (sellersj(AT)math.psu.edu), May 23 2000

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.


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