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A009235
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Expansion of exp(sinh(x)/exp(x)).
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0
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1, 1, -1, -1, 9, -23, -25, 583, -3087, 4401, 79087, -902097, 4783801, 2361049, -348382697, 4102879415, -24288551071, -47413121055, 3214104039007, -44472852461857, 326386562502889, 417716032223049, -55104307651136313, 962111031220099495
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,5
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COMMENTS
| Hankel transform is (-1)^C(n+1,2)*A108400. [From Paul Barry (pbarry(AT)wit.ie), Apr 15 2010]
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FORMULA
| a(n) = Sum_{k=0..n} (-2)^(n-k)*stirling2(n, k). - Vladeta Jovovic (vladeta(AT)eunet.rs), Apr 04 2003
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MATHEMATICA
| Exp[ Sinh[ x ]/Exp[ x ] ]
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CROSSREFS
| Cf. A004211.
Sequence in context: A156342 A133769 A165484 * A031023 A199714 A054302
Adjacent sequences: A009232 A009233 A009234 * A009236 A009237 A009238
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KEYWORD
| sign,easy
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AUTHOR
| R. H. Hardin (rhhardin(AT)att.net)
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EXTENSIONS
| Extended with signs Mar 15 1997 by Olivier Gerard.
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