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A012071
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arctanh(arcsin(arcsin(x)))=x+4/3!*x^3+92/5!*x^5+5160/7!*x^7+532880/9!*x^9...
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0
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1, 4, 92, 5160, 532880, 87726464, 21073486912, 6956206790528, 3020988238174464, 1670080968001854464, 1145224829994344492032, 953987340413779610175488, 948917210079076407043002368
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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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nn = 20; Table[(CoefficientList[Series[ArcTanh[ArcSin[ArcSin[x]]], {x, 0, 2*nn+1}], x] * Range[0, 2*nn+1]!)[[n]], {n, 2, 2*nn, 2}] (* Vaclav Kotesovec, Feb 05 2015 *)
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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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