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A009386
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Expansion of log(1+tanh(tan(x))).
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0
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0, 1, -1, 2, -6, 16, -72, 272, -1456, 7936, -47104, 353792, -2390784, 22368256, -180612096, 1903757312, -18625189888, 209865342976, -2431403622400, 29088885112832, -384624656646144, 4951498053124096, -72343735465672704
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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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Log[ 1+Tanh[ Tan[ x ] ] ]
CoefficientList[Series[Log[1 + Tanh[Tan[x]]], {x, 0, 20}], x] * Range[0, 20]! (* Vaclav Kotesovec, Jan 23 2015 *)
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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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STATUS
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approved
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