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A012742
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arctan(arctanh(x)*cos(x))=x-3/3!*x^3+53/5!*x^5-1799/7!*x^7...
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0
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1, -3, 53, -1799, 154985, -16589771, 3172731677, -721614303695, 241340829836497, -94965599172723859, 49224836859318783493, -29702702631352493918103, 22109389701103652762325561
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history;
text;
internal format)
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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[ArcTan[ArcTanh[x]Cos[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Nov 05 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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