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Search: id:A054625
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| A054625 |
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Number of n-bead necklaces with 6 colors. |
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+0
7
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| 0, 6, 21, 76, 336, 1560, 7826, 39996, 210126, 1119796, 6047412, 32981556, 181402676, 1004668776, 5597460306, 31345666736, 176319474366, 995685849696, 5642220380006, 32071565263716, 182807925027504, 1044616697187576, 5982804736593846
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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Index entries for sequences related to necklaces
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
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FORMULA
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(1/n)*Sum_{d|n} phi(d)*6^(n/d), n>0.
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MAPLE
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with(combstruct):A:=[N, {N=Cycle(Union(Z$6))}, unlabeled]: seq(count(A, size=n), n=0..22); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Dec 05 2007
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CROSSREFS
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Column 6 of A075195.
Cf. A054613.
Adjacent sequences: A054622 A054623 A054624 this_sequence A054626 A054627 A054628
Sequence in context: A027281 A006814 A108136 this_sequence A026628 A053768 A108306
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KEYWORD
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nonn
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AUTHOR
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njas, Apr 16 2000
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EXTENSIONS
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Edited by Christian G. Bower (bowerc(AT)usa.net), Sep 07 2002
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