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A013175
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sin(arctanh(x)+arctan(x))=2*x-8/3!*x^3+80/5!*x^5-4160/7!*x^7...
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2, -8, 80, -4160, 177920, -25548800, 2560563200, -702660608000, 129295622144000, -57197188186112000, 16886573106790400000, -10912577096233779200000, 4743735379760119808000000
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history;
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internal format)
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OFFSET
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0,1
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LINKS
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MATHEMATICA
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With[{nn=30}, Take[CoefficientList[Series[Sin[ArcTanh[x]+ArcTan[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Ray Chandler, Nov 29 2016 *)
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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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