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A032092
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Number of reversible strings with n-1 beads of 2 colors. 5 beads are black. String is not palindromic.
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2
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3, 9, 28, 60, 126, 226, 396, 636, 1001, 1491, 2184, 3080, 4284, 5796, 7752, 10152, 13167, 16797, 21252, 26532, 32890, 40326, 49140, 59332, 71253, 84903, 100688, 118608, 139128, 162248, 188496, 217872, 250971, 287793
(list; graph; refs; listen; history; internal format)
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OFFSET
| 7,1
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COMMENTS
| If the offset is changed to 3, this is the 2nd Witt transform of A000217 [Moree]. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 08 2008]
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LINKS
| C. G. Bower, Transforms (2)
Pieter Moree, The formal series Witt transform, Discr. Math. no. 295 vol. 1-3 (2005) 143-160. [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 08 2008]
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FORMULA
| "BHK[ 6 ]" (reversible, identity, unlabeled, 6 parts) transform of 1, 1, 1, 1...
G.f.: x^7(3+x^2)/((1-x)^6*(1+x)^3). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Nov 08 2008]
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CROSSREFS
| Sequence in context: A102558 A022767 A015638 * A026524 A022631 A027346
Adjacent sequences: A032089 A032090 A032091 * A032093 A032094 A032095
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KEYWORD
| nonn
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AUTHOR
| Christian G. Bower (bowerc(AT)usa.net)
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