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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
OFFSET
0,3
LINKS
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: A331439 A085521 A377760 * A279832 A012012 A229866
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved