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A012118
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tanh(arcsin(arcsinh(x)))=x-2/3!*x^3+24/5!*x^5-664/7!*x^7+36096/9!*x^9...
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0
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1, -2, 24, -664, 36096, -3054336, 389859456, -67637286144, 15712242647040, -4624447960903680, 1704772464238264320, -762137182003035340800, 409146648871581200056320, -258451658825083238747013120
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listen;
history;
text;
internal format)
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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[ArcSin[ArcSinh[x]]], {x, 0, nn}], x]Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Dec 02 2011 *)
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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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