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A012742 arctan(arctanh(x)*cos(x))=x-3/3!*x^3+53/5!*x^5-1799/7!*x^7... 0
1, -3, 53, -1799, 154985, -16589771, 3172731677, -721614303695, 241340829836497, -94965599172723859, 49224836859318783493, -29702702631352493918103, 22109389701103652762325561 (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[ArcTanh[x]Cos[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Nov 05 2015 *)

CROSSREFS

Sequence in context: A333563 A273802 A216931 * A012823 A098932 A100444

Adjacent sequences:  A012739 A012740 A012741 * A012743 A012744 A012745

KEYWORD

sign

AUTHOR

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

EXTENSIONS

Definition modified by Harvey P. Dale, Nov 05 2015

STATUS

approved

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Last modified January 19 20:48 EST 2022. Contains 350466 sequences. (Running on oeis4.)