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A009392
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Expansion of e.g.f.: log(1+tanh(x))/cosh(x).
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1
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0, 1, -1, -3, 8, 25, -121, -427, 3128, 12465, -124921, -555731, 7158128, 35135945, -557749921, -2990414715, 56767019408, 329655706465, -7316056402321, -45692713833379, 1164842760597368, 7777794952988025, -224574978081433321
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OFFSET
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0,4
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LINKS
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MATHEMATICA
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With[{nn=30}, CoefficientList[Series[Log[1+Tanh[x]]/Cosh[x], {x, 0, nn}], x] Range[ 0, nn]!] (* Harvey P. Dale, Oct 06 2014 *)
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CROSSREFS
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KEYWORD
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sign,easy
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AUTHOR
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EXTENSIONS
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Definition clarified and prior Mathematica program replaced by Harvey P. Dale, Oct 06 2014
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STATUS
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approved
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