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A009066 Expansion of e.g.f. cos(tan(sin(x))), even terms only. 1
1, -1, -3, 27, 1081, 3831, -1567563, -73024877, 4980721009, 1015258860783, 13245921859181, -20750351796802549, -3030717340459969623, 448360743236395743719, 256723841092587388040485 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..248

MATHEMATICA

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

CROSSREFS

Sequence in context: A012505 A331439 A085521 * A279832 A012012 A229866

Adjacent sequences:  A009063 A009064 A009065 * A009067 A009068 A009069

KEYWORD

sign

AUTHOR

R. H. Hardin

EXTENSIONS

Extended with signs by Olivier Gérard, Mar 15 1997

STATUS

approved

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Last modified September 21 21:32 EDT 2021. Contains 347605 sequences. (Running on oeis4.)