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A013242
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Expansion of e.g.f. arctanh(log(x+1) - tan(x)).
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0
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0, 0, -1, 0, -6, 8, -150, 448, -7560, 38432, -650160, 4827328, -85887648, 855019904, -16230758544, 204362847232, -4163699379840, 63548399361536, -1392682970270592, 24960951809133568, -588583828329908480
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OFFSET
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0,5
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LINKS
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EXAMPLE
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-1/2!*x^2 - 6/4!*x^4 + 8/5!*x^5 - 150/6!*x^6 ...
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MATHEMATICA
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With[{nn=20}, Drop[CoefficientList[Series[ArcTanh[Log[x+1]-Tan[x]], {x, 0, nn}], x] Range[0, nn]!, 2]] (* Harvey P. Dale, Aug 17 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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a(0)=a(1)=0 inserted and title improved by Sean A. Irvine, Aug 02 2018
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STATUS
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approved
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