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A012234
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sinh(arctan(arctanh(x)))=x+1/3!*x^3+9/5!*x^5+281/7!*x^7+13233/9!*x^9...
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1, 1, 9, 281, 13233, 1179729, 144386553, 25501409961, 5869292202465, 1744083324947745, 643531258862953065, 289976769842011018425, 156375721502624955046545, 99525811638120512862203505
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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[Sinh[ArcTan[ArcTanh[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Ray Chandler, Nov 28 2016 *)
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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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