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A024271 E.g.f. tan(x)*tan(sin(x))/2, even powers only. 0
0, 1, 6, 59, 940, 31637, 2005106, 166100111, 16050083800, 1874971666857, 279670143989598, 53041020901061987, 12139626880904714372, 3219275040968635076157, 979189869389394861709514, 342690421890075448877502135, 137691551060667051544057815472 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..16.

MATHEMATICA

With[{nn=40}, Take[CoefficientList[Series[Tan[x] Tan[Sin[x]]/2, {x, 0, nn}], x]Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, May 28 2012 *)

CROSSREFS

A009748.

Sequence in context: A024382 A053987 A024270 * A271964 A237576 A229097

Adjacent sequences:  A024268 A024269 A024270 * A024272 A024273 A024274

KEYWORD

nonn

AUTHOR

R. H. Hardin

EXTENSIONS

Extended and signs tested 03/97.

More terms from and definition clarified by Harvey P. Dale, May 28 2012

STATUS

approved

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Last modified January 22 13:41 EST 2020. Contains 331149 sequences. (Running on oeis4.)