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A012190
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tanh(arctan(sin(x)))=x-5/3!*x^3+121/5!*x^5-6845/7!*x^7+690481/9!*x^9...
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0
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1, -5, 121, -6845, 690481, -108594485, 24502918441, -7495966306925, 2984112329052001, -1498441322462840165, 926096248873419539161, -690670275602276172370205, 611502034169544516212107921
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OFFSET
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0,2
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LINKS
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Table of n, a(n) for n=0..12.
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EXAMPLE
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E.g.f.: tanh(arctan(sin(x))), even terms only. [From Harvey P. Dale, Sep 19 2011]
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Tanh[ArcTan[Sin[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Sep 19 2011 *)
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CROSSREFS
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Sequence in context: A179299 A012179 A012026 * A012077 A012046 A012151
Adjacent sequences: A012187 A012188 A012189 * A012191 A012192 A012193
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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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