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A013462
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Expansion of e.g.f.: exp(arctan(x)-arctanh(x))=1-4/3!*x^3+160/6!*x^6-1440/7!*x^7...
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0
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1, 0, 0, -4, 0, 0, 160, -1440, 0, -17920, 691200, -7257600, 3942400, -395366400, 14125363200, -175791616000, 295206912000, -24049778688000, 902471385088000, -13090802909184000, 43911376404480000
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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=20}, CoefficientList[Series[Exp[ArcTan[x]-ArcTanh[x]], {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, May 25 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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STATUS
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approved
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