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A009435
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Expansion of e.g.f.: log(1+x)/cosh(x).
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3
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0, 1, -1, -1, 0, 29, -105, 139, -2072, 31737, -247545, 1824151, -22456104, 313750293, -3929185169, 51584719523, -793292190480, 13137192234225, -221862616530705, 3947317975733039, -75492532592047280, 1522475446731094285
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OFFSET
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0,6
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LINKS
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Table of n, a(n) for n=0..21.
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FORMULA
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a(n) ~ (-1)^(n+1) * (n-1)! / cosh(1). - Vaclav Kotesovec, Oct 01 2014
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MATHEMATICA
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With[{nn=30}, CoefficientList[Series[Log[1+x]/Cosh[x], {x, 0, nn}], x] Range[ 0, nn]!] (* Harvey P. Dale, Oct 01 2014 *)
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CROSSREFS
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Sequence in context: A069472 A142138 A341550 * A126554 A258721 A009406
Adjacent sequences: A009432 A009433 A009434 * A009436 A009437 A009438
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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
Definition clarified and prior Mathematica program replaced by Harvey P. Dale, Oct 01 2014
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STATUS
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approved
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