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A012199
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tanh(arctan(arcsin(x)))=x-3/3!*x^3+49/5!*x^5-1691/7!*x^7+108961/9!*x^9...
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1
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1, -3, 49, -1691, 108961, -10415699, 1476822801, -274051642731, 68034310337345, -20698489943585315, 7945165226724184305, -3587174193714146380475, 1968139895275233488888545, -1234522114580149082237390195, 916981332590411294370399470545
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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[Tanh[ArcTan[ArcSin[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Oct 13 2014 *)
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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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