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A013206
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E.g.f.: log(sech(x)+sinh(x))=x-2/2!*x^2+6/3!*x^3-20/4!*x^4+120/5!*x^5...
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0
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0, 1, -2, 6, -20, 120, -872, 7056, -68000, 758400, -9460352, 130918656, -1995073280, 33173038080, -597457144832, 11587651270656, -240799724687360, 5337660866396160, -125711013390221312
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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With[{nn=20}, CoefficientList[Series[Log[Sech[x]+Sinh[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, May 16 2014 *)
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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Patrick Demichel (patrick.demichel(AT)hp.com)
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EXTENSIONS
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Definition clarified and zero prepended by Harvey P. Dale, May 16 2014
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STATUS
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approved
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