A009067 Expansion of e.g.f. cos(tan(sinh(x))), even terms only.

1, -1, -11, -253, -9911, -567449, -42551299, -3661191381, -252072060911, 34332471915599, 34386811167577477, 19519494372343282899, 10751436426722565995609, 6281979864370292158301879

Offset

0,3

Links

G. C. Greubel, Table of n, a(n) for n = 0..231

Mathematica

With[{nmax = 60}, CoefficientList[Series[Cos[Tan[Sinh[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(sinh(x))))); vector(#v\2, n, v[2*n-1]) \\ G. C. Greubel, Jul 24 2018

Crossrefs

Sequence in context: A346896 A012154 A009055 * A128683 A292335 A177912

Adjacent sequences: A009064 A009065 A009066 * A009068 A009069 A009070

Keyword

sign

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved