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Search: id:A032184
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| A032184 |
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"CIJ" (necklace, indistinct, labeled) transform of 1,3,5,7... |
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+0
8
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| 1, 4, 16, 96, 768, 7680, 92160, 1290240, 20643840, 371589120, 7431782400, 163499212800, 3923981107200, 102023508787200, 2856658246041600, 85699747381248000, 2742391916199936000, 93241325150797824000
(list; graph; listen)
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OFFSET
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1,2
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LINKS
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C. G. Bower, Transforms (2)
INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 565
Index entries for sequences related to necklaces
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FORMULA
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2^n*(n-1)! for n>1.
E.g.f.: (1+2x)/(1-2x) - Paul Barry (pbarry(AT)wit.ie), May 26 2003
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MATHEMATICA
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lst={1}; Do[AppendTo[lst, 2^n*(n-1)! ], {n, 2, 5!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Nov 08 2008]
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CROSSREFS
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Apart from initial term, same as A066318.
Sequence in context: A131928 A098580 A027745 this_sequence A111976 A130683 A091040
Adjacent sequences: A032181 A032182 A032183 this_sequence A032185 A032186 A032187
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KEYWORD
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nonn,easy
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AUTHOR
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Christian G. Bower (bowerc(AT)usa.net)
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