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A013207
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Expansion of e.g.f.: log(sech(x)+arcsinh(x))=x-2/2!*x^2+4/3!*x^3-12/4!*x^4+68/5!*x^5...
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0
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0, 1, -2, 4, -12, 68, -440, 3064, -26208, 265936, -2945152, 35730176, -485182720, 7235106240, -115677206528, 1984468240000, -36707903762432, 725871298851072, -15190637885095936, 336136505074527232
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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]+ArcSinh[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Mar 22 2018 *)
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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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Zero prepended and definition clarified by Harvey P. Dale, Mar 22 2018
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STATUS
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approved
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