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A012141
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tanh(arcsin(arctanh(x)))=x+1/3!*x^3+9/5!*x^5+281/7!*x^7+20913/9!*x^9...
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1, 1, 9, 281, 20913, 2869329, 613734393, 185272366761, 74333015297505, 38107181118565665, 24270343990842570345, 18795056467624757017785, 17394205995630055629900945, 18964089582659357000823035505
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Tanh[ArcSin[ArcTanh[x]]], {x, 0, nn}], x]Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Feb 02 2012 *)
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CROSSREFS
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KEYWORD
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nonn
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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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