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A013179
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cos(arctanh(x)+arctan(x))=1-4/2!*x^2+16/4!*x^4-640/6!*x^6+21760/8!*x^8...
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0
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1, -4, 16, -640, 21760, -2291200, 223436800, -44438118400, 8725110784000, -2796896567296000, 926039081943040000, -435519369139978240000, 218626979887002419200000, -141711151230417633280000000
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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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With[{nn=30}, Take[CoefficientList[Series[Cos[ArcTanh[x]+ArcTan[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -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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