A009037 Expansion of E.g.f. cos(sin(sin(x))), even powers only.

1, -1, 9, -153, 4273, -177489, 10342137, -800697641, 78896218081, -9587206592289, 1403875965476969, -243412313149166137, 49273184499900888465, -11506634193913551650161, 3067851166645384439929945

Offset

0,3

Links

G. C. Greubel, Table of n, a(n) for n = 0..250

Mathematica

With[{nmax = 60}, CoefficientList[Series[Cos[Sin[Sin[x]]], {x, 0, nmax}], x]*Range[0, nmax]!][[1 ;; -1 ;; 2]] (* G. C. Greubel, Jul 22 2018 *)

Prog

(PARI) x='x+O('x^60); v=Vec(serlaplace(cos(sin(sin(x))))); vector(#v\2, n, v[2*n-1]) \\ G. C. Greubel, Jul 22 2018

Crossrefs

Sequence in context: A361190 A113391 A045755 * A012148 A193540 A193543

Adjacent sequences: A009034 A009035 A009036 * A009038 A009039 A009040

Keyword

sign

Author

R. H. Hardin

Extensions

Extended with signs by Olivier Gérard, Mar 15 1997

Status

approved