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A012452
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arctanh(arctan(x)*tan(x))=2/2!*x^2+400/6!*x^6-2688/8!*x^8...
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0
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0, 2, 0, 400, -2688, 1873408, -60938240, 49450805248, -4291105193984, 4345356280528896, -769792296435580928, 962815994229666349056, -298377426990773724774400, 452668537171760533299265536
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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[ArcTan[x]*Tan[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Ray Chandler, Nov 28 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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STATUS
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approved
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