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A012053
tan(sin(arctanh(x)))=x+3/3!*x^3+41/5!*x^5+1187/7!*x^7+54449/9!*x^9...
0
1, 3, 41, 1187, 54449, 3092867, 95391193, -48911197853, -28872742806559, -14158572958744829, -7331436852140378359, -4214348760692049240797, -2723345361371865447323759, -1980230597926036207884317053
OFFSET
0,2
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Tan[Sin[ArcTanh[x]]], {x, 0, nn}], x]Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Sep 25 2012 *)
CROSSREFS
Sequence in context: A222524 A241704 A181675 * A012162 A012225 A012129
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved