A012988 arctan(arctan(x)+arcsin(x))=2*x-17/3!*x^3+881/5!*x^5-111919/7!*x^7...

2, -17, 881, -111919, 26533505, -10100912631, 5639610453681, -4341268802719599, 4406801928941004417, -5703476313460410444519, 9166802819086051420527153, -17912428427903720892882856479

Offset

0,1

Links

Table of n, a(n) for n=0..11.

Mathematica

With[{nn=30}, Take[CoefficientList[Series[ArcTan[ArcTan[ x]+ ArcSin[x]], {x, 0, nn}], x]Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Sep 30 2011 *)

Crossrefs

Sequence in context: A012944 A013099 A013060 * A261535 A327020 A058233

Adjacent sequences: A012985 A012986 A012987 * A012989 A012990 A012991

Keyword

sign

Author

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

Extensions

Definition corrected by Harvey P. Dale, Sep 30 2011

Status

approved