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A012875
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Expansion of e.g.f.: arctanh(sech(x)*log(x+1))=x-1/2!*x^2+1/3!*x^3-12/4!*x^4+63/5!*x^5...
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0
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0, 1, -1, 1, -12, 63, -375, 3687, -35056, 378613, -4917645, 67955413, -1033969596, 17404675923, -314140085987, 6110547378491, -127722302945280, 2840677016304009, -67146193511101593, 1681517639666168201
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OFFSET
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0,5
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LINKS
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MATHEMATICA
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With[{nn=20}, CoefficientList[Series[ArcTanh[Sech[x]Log[x+1]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Feb 16 2016 *)
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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, Feb 16 2016
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STATUS
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approved
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