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A012713
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E.g.f.: arctan(arctanh(x)*exp(x))=x+2/2!*x^2+3/3!*x^3-12/4!*x^4-147/5!*x^5...
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0
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0, 1, 2, 3, -12, -147, -890, 63, 76776, 1130489, 6587338, -92728933, -3395342500, -47724446811, -11416580786, 18058083754519, 494993369091536, 5229048665015409, -122759838344591214, -7368934381520578637
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internal format)
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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[ArcTan[ArcTanh[x]Exp[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, Dec 06 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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Definition clarified and initial term provided by Harvey P. Dale, Dec 06 2013
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STATUS
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approved
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