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A012057
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arcsinh(sin(arctanh(x)))=x+4/5!*x^5-80/7!*x^7-3440/9!*x^9-764800/11!*x^11...
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1
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1, 0, 4, -80, -3440, -764800, -107953600, -25833184000, -6745073504000, -2368021859840000, -968030415297920000, -487629248007416320000, -285882353240737277440000, -197729299896592542208000000
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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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nn = 20; Table[(CoefficientList[Series[ArcSinh[Sin[ArcTanh[x]]], {x, 0, 2*nn+1}], x] * Range[0, 2*nn+1]!)[[n]], {n, 2, 2*nn, 2}] (* Vaclav Kotesovec, Feb 03 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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STATUS
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approved
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