A012998 - OEIS

A012998

sin(arctan(x)+tan(x))=2*x-8/3!*x^3+72/5!*x^5-3936/7!*x^7...

2, -8, 72, -3936, 193920, -21876736, 2967878656, -589063146496, 149737853943808, -48291040167362560, 19310260456438693888, -9310185546185219768320, 5359263862743046978797568

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

OFFSET

0,1

LINKS

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

MATHEMATICA

With[{nn=30}, Take[CoefficientList[Series[Sin[ArcTan[x]+Tan[x]], {x, 0, nn}], x] Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Dec 17 2017 *)

CROSSREFS

Sequence in context: A374872 A305000 A013002 * A143760 A064605 A356108

Adjacent sequences: A012995 A012996 A012997 * A012999 A013000 A013001

KEYWORD

sign

AUTHOR

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

STATUS

approved