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A012175
sin(tan(arctanh(x)))=x+3/3!*x^3+41/5!*x^5+1019/7!*x^7+12305/9!*x^9...
0
1, 3, 41, 1019, 12305, -7478221, -3005647943, -1143787246421, -494108406644959, -250135591701350045, -148735005859748997559, -103273288933359010564517, -83050756624193183081902799
OFFSET
0,2
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Sin[Tan[ArcTanh[x]]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Feb 07 2015 *)
CROSSREFS
Sequence in context: A075022 A367981 A300281 * A007313 A222524 A241704
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved