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A009413
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Expansion of log(1+x)*cosh(sinh(x)).
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0
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0, 1, -1, 5, -12, 69, -285, 1833, -11536, 91689, -782865, 7685325, -82339884, 973147629, -12466581309, 172666976433, -2565893101440, 40742019960785, -688062399893505, 12315242802523797, -232832786354392620
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OFFSET
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0,4
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LINKS
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Table of n, a(n) for n=0..20.
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FORMULA
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a(n) ~ (n-1)! * (-1)^(n+1) * cosh(sinh(1)). - Vaclav Kotesovec, Jan 23 2015
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MATHEMATICA
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Log[ 1+x ]*Cosh[ Sinh[ x ] ]
CoefficientList[Series[Cosh[Sinh[x]]*Log[1 + x], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 23 2015 *)
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CROSSREFS
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Sequence in context: A129723 A219770 A246176 * A009429 A207821 A297644
Adjacent sequences: A009410 A009411 A009412 * A009414 A009415 A009416
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KEYWORD
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sign,easy
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AUTHOR
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R. H. Hardin
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EXTENSIONS
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Extended with signs by Olivier Gérard, Mar 15 1997
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STATUS
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approved
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