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A009067
Expansion of e.g.f. cos(tan(sinh(x))), even terms only.
1
1, -1, -11, -253, -9911, -567449, -42551299, -3661191381, -252072060911, 34332471915599, 34386811167577477, 19519494372343282899, 10751436426722565995609, 6281979864370292158301879
OFFSET
0,3
LINKS
MATHEMATICA
With[{nmax = 60}, CoefficientList[Series[Cos[Tan[Sinh[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(sinh(x))))); vector(#v\2, n, v[2*n-1]) \\ G. C. Greubel, Jul 24 2018
CROSSREFS
Sequence in context: A012154 A377424 A009055 * A128683 A292335 A177912
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs by Olivier Gérard, Mar 15 1997
STATUS
approved