A012069 arcsinh(arcsin(arcsin(x)))=x+1/3!*x^3+17/5!*x^5+561/7!*x^7+39521/9!*x^9...

1, 1, 17, 561, 39521, 4429217, 749371633, 176540328017, 55517224330689, 22448523976439873, 11356291769744087761, 7026618486154627990385, 5220988665867670545052193, 4587518335717939527563335649

Offset

0,3

Links

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

Mathematica

With[{nn=30}, Take[CoefficientList[Series[ArcSinh[ArcSin[ArcSin[x]]], {x, 0, nn}], x]Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Dec 06 2012 *)

Crossrefs

Sequence in context: A218351 A197395 A280181 * A191865 A249862 A056771

Adjacent sequences: A012066 A012067 A012068 * A012070 A012071 A012072

Keyword

nonn

Author

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

Status

approved