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A009040
Expansion of E.g.f. cos(sin(tanh(x))), even powers only.
1
1, -1, 13, -373, 18649, -1433129, 156563045, -23043285021, 4392102360241, -1051530622359889, 308633929353801661, -108880766753141666757, 45418989883077539513225, -22097331609699052757909881
OFFSET
0,3
LINKS
MATHEMATICA
With[{nn=30}, Take[CoefficientList[Series[Cos[Sin[Tanh[x]]], {x, 0, nn}], x] Range[0, nn]!, {1, -1, 2}]] (* Harvey P. Dale, Jun 24 2013 *)
PROG
(PARI) x='x+O('x^60); v=Vec(serlaplace(cos(sin(tanh(x))))); vector(#v\2, n, v[2*n-1]) \\ G. C. Greubel, Jul 22 2018
CROSSREFS
Sequence in context: A330255 A280796 A183472 * A009085 A012013 A082403
KEYWORD
sign
AUTHOR
EXTENSIONS
Extended with signs by Olivier GĂ©rard, Mar 15 1997
Prior Mathematica program replaced by Harvey P. Dale, Jun 24 2013
STATUS
approved