A009075 Expansion of e.g.f. cos(tan(x)*cosh(x)), even terms only.

1, -1, -19, -397, -7943, 64551, 43466469, 7570028763, 1224976528753, 203222727578703, 33945910273599581, 5001827577751516739, 201232322297192328041, -395596937210124802877833

Offset

0,3

Links

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

Mathematica

With[{nmax = 60}, CoefficientList[Series[Cos[Tan[x]*Cosh[x]], {x, 0, nmax}], x]*Range[0, nmax]!][[1 ;; -1 ;; 2]] (* G. C. Greubel, Jul 24 2018 *)

Prog

(PARI) x='x+O('x^50); v=Vec(serlaplace(cos(tan(x)*cosh(x)))); vector(#v\2, n, v[2*n-1]) \\ G. C. Greubel, Jul 24 2018

Crossrefs

Sequence in context: A072359 A222835 A094737 * A221584 A015694 A099277

Adjacent sequences: A009072 A009073 A009074 * A009076 A009077 A009078

Keyword

sign

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved