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Search: id:A054628
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| A054628 |
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Number of n-bead necklaces with 9 colors. |
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+0
2
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| 0, 9, 45, 249, 1665, 11817, 88725, 683289, 5381685, 43046889, 348684381, 2852823609, 23535840225, 195528140649, 1634056945605, 13726075481049, 115813764494505, 981010688215689, 8338590871415805, 71097458824894329, 607883273127192897
(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)*9^(n/d), n>0.
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MAPLE
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with(combstruct):A:=[N, {N=Cycle(Union(Z$9))}, unlabeled]: seq(count(A, size=n), n=0..20); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Dec 05 2007
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CROSSREFS
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Column 9 of A075195.
Sequence in context: A111640 A024209 A026092 this_sequence A132133 A009410 A030113
Adjacent sequences: A054625 A054626 A054627 this_sequence A054629 A054630 A054631
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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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