

A009052


Expansion of e.g.f. cos(sin(x)^2), even terms only.


1



1, 0, 12, 240, 2352, 136320, 15140928, 971093760, 28387408128, 4688909905920, 1262963768650752, 191995869733662720, 17544464368915034112, 1212607904700871311360, 1171249187182930708021248
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OFFSET

0,3


LINKS

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


MATHEMATICA

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


PROG

(PARI) x='x+O('x^50); v=Vec(serlaplace(cos(sin(x)^2))); vector(#v\2, n, v[2*n1]) \\ G. C. Greubel, Jul 23 2018


CROSSREFS

Sequence in context: A189883 A033469 A012544 * A213449 A012303 A119837
Adjacent sequences: A009049 A009050 A009051 * A009053 A009054 A009055


KEYWORD

sign


AUTHOR

R. H. Hardin


EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997


STATUS

approved



