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A012069
arcsinh(arcsin(arcsin(x)))=x+1/3!*x^3+17/5!*x^5+561/7!*x^7+39521/9!*x^9...
0
1, 1, 17, 561, 39521, 4429217, 749371633, 176540328017, 55517224330689, 22448523976439873, 11356291769744087761, 7026618486154627990385, 5220988665867670545052193, 4587518335717939527563335649
OFFSET
0,3
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
KEYWORD
nonn
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved