A009055 Expansion of e.g.f. cos(sinh(tan(x))), even terms only.

1, -1, -11, -253, -9463, -491609, -30257347, -1480493589, 177416283793, 125705754161615, 53738108098148101, 22477151211215445843, 9977406312993326490265, 4802660699035958910256759

Offset

0,3

Links

G. C. Greubel, Table of n, a(n) for n = 0..234

Maple

seq(coeff(series(factorial(n)*cos(sinh(tan(x))), x, n+1), x, n), n=0..30, 2); # Muniru A Asiru, Jul 24 2018

Mathematica

With[{nmax = 60}, CoefficientList[Series[Cos[Sinh[Tan[x]]], {x, 0, nmax}], x]*Range[0, nmax]!][[1 ;; -1 ;; 2]] (* G. C. Greubel, Jul 23 2018 *)

Prog

(PARI) x='x+O('x^60); v=Vec(serlaplace(cos(sinh(tan(x))))); vector(#v\2, n, v[2*n-1]) \\ G. C. Greubel, Jul 23 2018

Crossrefs

Sequence in context: A346896 A012154 A377424 * A009067 A128683 A292335

Adjacent sequences: A009052 A009053 A009054 * A009056 A009057 A009058

Keyword

sign

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved