A009079 Expansion of e.g.f. cos(tan(x)*sinh(x)), even powers only.

1, 0, -12, -360, -11312, -342720, 1391808, 3011648640, 712998408448, 151782346782720, 33053467644945408, 7470073537438955520, 1689905119837405401088, 334766606514085190615040, 19605053176568811703615488, -43798309867240412782195998720

Offset

0,3

Links

G. C. Greubel, Table of n, a(n) for n = 0..239

Maple

seq(coeff(series(factorial(n)*cos(tan(x)*sinh(x)), x, n+1), x, n), n=0..30, 2); # Muniru A Asiru, Jul 25 2018

Mathematica

With[{nn=40}, Take[CoefficientList[Series[Cos[Tan[x] Sinh[x]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Aug 23 2014 *)

Prog

(PARI) x='x+O('x^60); v=Vec(serlaplace(cos(tan(x)*sinh(x)))); vector(#v\2, n, v[2*n-1]) \\ G. C. Greubel, Jul 24 2018

Crossrefs

Sequence in context: A012386 A130213 A012633 * A012379 A012424 A009165

Adjacent sequences: A009076 A009077 A009078 * A009080 A009081 A009082

Keyword

sign

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

More terms from and prior Mathematica program replaced by Harvey P. Dale, Aug 23 2014

Status

approved