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A012187
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arctan(arctan(sin(x)))=x-5/3!*x^3+129/5!*x^5-8133/7!*x^7+941601/9!*x^9...
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1, -5, 129, -8133, 941601, -173748453, 46802237793, -17335271239653, 8453548403430081, -5250998394750249285, 4048144275997010258625, -3792939800731791655328133, 4245216299498829593948709345
(list;
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refs;
listen;
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[ArcTan[Sin[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Feb 09 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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