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A060532
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Number of ways to color vertices of a heptagon using <= n colors, allowing rotations and reflections.
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2
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0, 1, 18, 198, 1300, 5895, 20646, 60028, 151848, 344925, 719290, 1399266, 2569788, 4496323, 7548750, 12229560, 19206736, 29351673, 43782498, 63913150, 91508580, 128746431, 178285558, 243341748, 327771000, 436160725, 573929226
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,3
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LINKS
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Harry J. Smith, Table of n, a(n) for n=0,...,200
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FORMULA
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(n^7+7*n^4+6*n)/14.
G.f.: x*(1+10*x+82*x^2+164*x^3+101*x^4+2*x^5)/(1-x)^8. [Colin Barker, Jan 29 2012]
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PROG
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(PARI) { for (n=0, 200, write("b060532.txt", n, " ", (n^7 + 7*n^4 + 6*n)/14); ) } [From Harry J. Smith, Jul 06 2009]
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CROSSREFS
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Sequence in context: A181711 A042940 A034727 * A073397 A020920 A083812
Adjacent sequences: A060529 A060530 A060531 * A060533 A060534 A060535
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KEYWORD
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nonn
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AUTHOR
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N. J. A. Sloane, Apr 12 2001
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STATUS
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approved
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