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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 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..13.

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

Adjacent sequences:  A012805 A012806 A012807 * A012809 A012810 A012811

KEYWORD

sign

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

STATUS

approved

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Last modified July 15 23:32 EDT 2020. Contains 335774 sequences. (Running on oeis4.)