A009705 E.g.f. tan(tan(x)*sin(x)), even powers only.

0, 2, 4, 302, 8104, 947642, 86855404, 16203909542, 3130092938704, 896924477276402, 290713861720990804, 121467176505314129822, 58492863120535523766904, 33925794100542844193202602

Offset

0,2

Links

Table of n, a(n) for n=0..13.

Example

tan(tan(x)*sin(x)) = 2/2!*x^2+4/4!*x^4+302/6!*x^6+8104/8!*x^8...

Mathematica

With[{nn=30}, Take[CoefficientList[Series[Tan[Tan[x]Sin[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, May 09 2012 *)

Crossrefs

Sequence in context: A012437 A012434 A012368 * A012372 A012613 A012618

Adjacent sequences: A009702 A009703 A009704 * A009706 A009707 A009708

Keyword

nonn

Author

R. H. Hardin

Extensions

Extended and signs tested Mar 15 1997 by Olivier Gérard.

Status

approved