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A013188
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E.g.f.: log(cosh(x)+arctan(x))=x-3/3!*x^3+12/4!*x^4-7/5!*x^5-168/6!*x^6...
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0
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0, 1, 0, -3, 12, -7, -168, 917, -1568, -7183, 198400, -3803987, 27605248, 316369129, -8352339968, 40892465221, 772060278784, -12655402122271, 84749115129856, -1539257113273507, 2576755050676224
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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[Log[Cosh[x]+ArcTan[x]], {x, 0, nn}], x]Range[0, nn]!] (* Harvey P. Dale, Mar 12 2013 *)
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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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First term prepended and definition clarified by Harvey P. Dale, Mar 12 2013
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STATUS
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approved
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