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A012141
tanh(arcsin(arctanh(x)))=x+1/3!*x^3+9/5!*x^5+281/7!*x^7+20913/9!*x^9...
0
1, 1, 9, 281, 20913, 2869329, 613734393, 185272366761, 74333015297505, 38107181118565665, 24270343990842570345, 18795056467624757017785, 17394205995630055629900945, 18964089582659357000823035505
OFFSET
0,3
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Tanh[ArcSin[ArcTanh[x]]], {x, 0, nn}], x]Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Feb 02 2012 *)
CROSSREFS
Sequence in context: A177107 A346187 A012234 * A328123 A110553 A330360
KEYWORD
nonn
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved