A012066 arctan(arcsin(arcsin(x)))=x+12/5!*x^5+248/7!*x^7+21648/9!*x^9...

1, 0, 12, 248, 21648, 2241088, 390536000, 91111189120, 28811937609984, 11657540060256256, 5912796798580972544, 3665610214092467574784, 2729315998404117133692928, 2402622277659457905178820608

Offset

0,3

Links

Table of n, a(n) for n=0..13.

Mathematica

With[{nn=30}, Take[CoefficientList[Series[ArcTan[ArcSin[ArcSin[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Dec 09 2011 *)

Crossrefs

Sequence in context: A126687 A064749 A009472 * A239777 A245919 A245913

Adjacent sequences: A012063 A012064 A012065 * A012067 A012068 A012069

Keyword

nonn

Author

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

Status

approved