A009039 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A009039

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

1, -1, -3, 27, 2425, 143031, 8956533, 618394579, 46232494321, 3608163168111, 254307747662573, -15725973912655477, -32163339922362247575, -26444005741558393208281, -19705272022676306432282267

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,3

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..237

MATHEMATICA

With[{nmax = 60}, CoefficientList[Series[Cos[Sin[Tan[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(tan(x))))); vector(#v\2, n, v[2*n-1]) \\ G. C. Greubel, Jul 22 2018

CROSSREFS

Sequence in context: A184278 A158113 A078233 * A137092 A122215 A122217

Adjacent sequences: A009036 A009037 A009038 * A009040 A009041 A009042