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A012156
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arctanh(tan(sinh(x)))=x+5/3!*x^3+121/5!*x^5+7069/7!*x^7+763057/9!*x^9...
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0
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1, 5, 121, 7069, 763057, 132103157, 33527321257, 11731117858573, 5412661283979361, 3184128808387236581, 2326120405922560979929, 2066008261961436163683709, 2192446490036211173903631121
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OFFSET
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0,2
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LINKS
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FORMULA
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[ArcTanh[Tan[Sinh[x]]], {x, 0, nn}], x]Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Mar 17 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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EXTENSIONS
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STATUS
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approved
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