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A012562
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arctanh(sinh(x)*arctan(x)) = 2/2!*x^2 - 4/4!*x^4 + 350/6!*x^6 - 11240/8!*x^8 + ...
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0
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0, 2, -4, 350, -11240, 1703578, -193890860, 49492653366, -12321392081232, 4919573673167538, -2124948350723616724, 1246509899975408733326, -820629733751515166342200, 671843179144303883329974346, -622270861646882104886119580924
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OFFSET
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0,2
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[ArcTanh[Sinh[x]ArcTan[x]], {x, 0, nn}], x]Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Nov 16 2012 *)
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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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STATUS
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approved
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