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A032184
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"CIJ" (necklace, indistinct, labeled) transform of 1,3,5,7...
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7
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1, 4, 16, 96, 768, 7680, 92160, 1290240, 20643840, 371589120, 7431782400, 163499212800, 3923981107200, 102023508787200, 2856658246041600, 85699747381248000, 2742391916199936000, 93241325150797824000
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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LINKS
| C. G. Bower, Transforms (2)
Guo-Niu Han, Enumeration of Standard Puzzles
INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 565
Index entries for sequences related to necklaces
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FORMULA
| 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
| 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
| Apart from initial term, same as A066318.
Sequence in context: A131928 A098580 A027745 * A111976 A130683 A091040
Adjacent sequences: A032181 A032182 A032183 * A032185 A032186 A032187
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KEYWORD
| nonn,easy
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AUTHOR
| Christian G. Bower (bowerc(AT)usa.net)
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