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Search: id:A141148
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| A141148 |
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Number of aperiodic ternary necklaces with n berds of each color and no adjacent berds of the same color. |
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3
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| 2, 3, 14, 65, 346, 1929, 11442, 70310, 445928, 2896239, 19186738, 129184583, 881808726, 6089840427, 42482905678, 298976072384, 2120377458898, 15141288786096, 108784152585234, 785869928763325, 5705406374237814
(list; graph; listen)
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OFFSET
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1,1
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LINKS
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L. Q. Eifler, K. B. Reid Jr., D. P. Roselle, Sequences with adjacent elements unequal, Aequationes Mathematicae 6 (2-3), 1971.
Max Alekseyev, PARI scripts for various problems
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FORMULA
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a(n) = Sum[d|n] moebius(n/d) * A141147(d) / n
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CROSSREFS
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Cf. A110706, A110707, A110710, A110711, A141146, A141147.
Sequence in context: A128849 A153741 A070207 this_sequence A064184 A154750 A041167
Adjacent sequences: A141145 A141146 A141147 this_sequence A141149 A141150 A141151
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KEYWORD
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nonn
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AUTHOR
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Max Alekseyev (maxale(AT)gmail.com), Jun 10 2008
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