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A012217
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arcsinh(arctan(arcsinh(x)))=x-4/3!*x^3+92/5!*x^5-5216/7!*x^7...
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0
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1, -4, 92, -5216, 551504, -94170176, 23756009664, -8329952294400, 3882725102061824, -2324928136769545216, 1740643970081187412992, -1594058498088175066406912, 1753510369493317462917828608
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history;
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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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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[ArcSinh[ArcTan[ArcSinh[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Mar 10 2013 *)
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CROSSREFS
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Sequence in context: A265238 A322769 A012071 * A012135 A221287 A177411
Adjacent sequences: A012214 A012215 A012216 * A012218 A012219 A012220
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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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