A012196 arctan(arctan(arcsin(x)))=x-3/3!*x^3+57/5!*x^5-2419/7!*x^7+198801/9!*x^9...

1, -3, 57, -2419, 198801, -25335395, 4816346441, -1245230547347, 427817295559329, -186336568593526211, 101138532707457916121, -66575531182102753799603, 52444802490227536269748273

Offset

0,2

Links

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

Mathematica

With[{nn=30}, Take[CoefficientList[Series[ArcTan[ArcTan[ArcSin[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Mar 15 2015 *)

Crossrefs

Sequence in context: A308404 A009723 A069992 * A012090 A210674 A281184

Adjacent sequences: A012193 A012194 A012195 * A012197 A012198 A012199

Keyword

sign

Author

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

Extensions

Definition clarified by Harvey P. Dale, Mar 15 2015

Status

approved