login
A012808
arcsinh(sec(x)*arctan(x))=x+28/5!*x^5-728/7!*x^7+54416/9!*x^9...
0
1, 0, 28, -728, 54416, -5676352, 900432960, -193766436992, 55349093955840, -20153308820338688, 9138844606925237248, -5050190610067417167872, 3343568694767924711428096, -2613638716122945595362951168
OFFSET
0,3
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[ArcSinh[Sec[x]ArcTan[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Sep 21 2015 *)
CROSSREFS
Sequence in context: A215857 A185987 A004293 * A226991 A277060 A229463
KEYWORD
sign
AUTHOR
Patrick Demichel (patrick.demichel(AT)hp.com)
STATUS
approved