A009480 E.g.f. sin(sin(x))/cosh(x) (odd powers only).

1, -5, 57, -1157, 36753, -1702725, 109438409, -9375819525, 1036122313377, -143739691502213, 24474485553698265, -5019553507299889285, 1220644145831870289713, -347288265291867822117829

Offset

1,2

Links

Table of n, a(n) for n=1..14.

Mathematica

With[{nn=30}, Take[CoefficientList[Series[Sin[Sin[x]]/Cosh[x], {x, 0, nn}], x]Range[0, nn-1]!, {2, -1, 2}]] (* Harvey P. Dale, Oct 19 2012 *)

Crossrefs

Sequence in context: A285067 A234293 A244288 * A009481 A209498 A209739

Adjacent sequences: A009477 A009478 A009479 * A009481 A009482 A009483

Keyword

sign

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved