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A012767 E.g.f.: arctan(cosh(x)*tan(x))=x+3/3!*x^3-35/5!*x^5-1057/7!*x^7+59865/9!*x^9... 0
1, 3, -35, -1057, 59865, 5446683, -726781835, -133713611977, 32440474082865, 10034804733270963, -3854719922524818035, -1800259494456990656497, 1004556790822666566963465 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..12.

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[ArcTan[Cosh[x]Tan[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Aug 01 2012 *)

CROSSREFS

Sequence in context: A287405 A107712 A062699 * A279377 A215582 A136525

Adjacent sequences:  A012764 A012765 A012766 * A012768 A012769 A012770

KEYWORD

sign

AUTHOR

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

EXTENSIONS

Definition clarified by Harvey P. Dale, Aug 01 2012

STATUS

approved

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Last modified May 21 22:24 EDT 2019. Contains 323467 sequences. (Running on oeis4.)