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A024245 Expansion of tan(tan(x)*sin(x))/2. 0
0, 1, 2, 151, 4052, 473821, 43427702, 8101954771, 1565046469352, 448462238638201, 145356930860495402, 60733588252657064911, 29246431560267761883452, 16962897050271422096601301 (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[Tan[Tan[x]*Sin[x]]/2, {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, May 05 2015 *)

CROSSREFS

A009705.

Sequence in context: A128350 A046473 A261967 * A113576 A102458 A206309

Adjacent sequences:  A024242 A024243 A024244 * A024246 A024247 A024248

KEYWORD

nonn

AUTHOR

R. H. Hardin

EXTENSIONS

Extended and signs tested 03/97.

Prior Mathematica program replaced by Harvey P. Dale, May 05 2015

STATUS

approved

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Last modified July 22 08:29 EDT 2019. Contains 325216 sequences. (Running on oeis4.)