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A024278 Expansion of e.g.f.: tan(tan(x))*sin(x)/2. 0
0, 1, 6, 179, 9676, 854597, 111361298, 20061390071, 4771665341848, 1447947783210249, 545795035419716382, 250167844738073041595, 137013989756844496168292, 88367083240335992790622797 (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, Sep 09 2012 *)

CROSSREFS

Cf. A009698.

Sequence in context: A012227 A012152 A165928 * A062240 A253779 A046989

Adjacent sequences:  A024275 A024276 A024277 * A024279 A024280 A024281

KEYWORD

nonn

AUTHOR

R. H. Hardin

EXTENSIONS

Extended and signs tested 03/97.

Definition clarified by Harvey P. Dale, Sep 09 2012

STATUS

approved

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Last modified September 21 17:46 EDT 2019. Contains 327273 sequences. (Running on oeis4.)