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A009781
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Expansion of e.g.f.: tanh(log(1+x))/cosh(x).
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1
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0, 1, -1, -3, 12, -5, -75, 203, -1232, 16245, -44685, -957671, 11106876, -34555105, -281002631, 4852910775, -67849574400, 823102605865, -1467960664185, -158552006816779, 2993025524196940, -21779819623624125
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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[Tanh[Log[1+x]]/Cosh[x], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Nov 12 2013 *)
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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 previous Mathematica program replaced by Harvey P. Dale, Nov 12 2013
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STATUS
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approved
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