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A012728
sin(arctanh(x)*arctan(x))=2/2!*x^2+88/6!*x^6+112032/10!*x^10...
0
2, 88, 112032, 339519360, -45065746337280, -13641523340876605440, -5909672857101969499054080, -4213934311138261721595771125760
OFFSET
0,1
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Sin[ArcTanh[x]*ArcTan[x]], {x, 0, nn}], x] Range[0, nn]!, {3, -1, 4}]] (* Ray Chandler, Nov 28 2016 *)
CROSSREFS
Sequence in context: A053950 A266182 A362519 * A012733 A058459 A355272
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved