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A012461
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sinh(arctan(x)*arctan(x))=2/2!*x^2-16/4!*x^4+488/6!*x^6-30336/8!*x^8...
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1
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0, 2, -16, 488, -30336, 3061152, -450481920, 90676698240, -23889578496000, 7972943138664960, -3286129765438771200, 1638857583672607549440, -972524875970827007262720, 677113960144029088030433280
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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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nn = 20; Table[(CoefficientList[Series[Sinh[ArcTan[x]^2], {x, 0, 2*nn}], x] * Range[0, 2*nn]!)[[n]], {n, 1, 2*nn+1, 2}] (* Vaclav Kotesovec, Feb 08 2015 *)
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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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