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A012187 arctan(arctan(sin(x)))=x-5/3!*x^3+129/5!*x^5-8133/7!*x^7+941601/9!*x^9... 0
1, -5, 129, -8133, 941601, -173748453, 46802237793, -17335271239653, 8453548403430081, -5250998394750249285, 4048144275997010258625, -3792939800731791655328133, 4245216299498829593948709345 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..12.

MATHEMATICA

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 *)

CROSSREFS

Sequence in context: A012136 A012022 A012176 * A012083 A012226 A281818

Adjacent sequences:  A012184 A012185 A012186 * A012188 A012189 A012190

KEYWORD

sign

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

EXTENSIONS

Definition clarified by Harvey P. Dale, Feb 09 2015

STATUS

approved

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Last modified October 15 09:37 EDT 2018. Contains 316211 sequences. (Running on oeis4.)