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A009016
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Expansion of E.g.f.: cos(cosh(x)*x) (even powers only).
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7
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1, -1, -11, -61, 1737, 88679, 2086525, -45950997, -9763133167, -705668046769, -17356978593659, 3823112141007763, 788728947108214489, 82036502117747569079, 1412038521698998808077
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OFFSET
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0,3
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LINKS
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MATHEMATICA
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With[{nmax = 60}, CoefficientList[Series[Cos[x*Cosh[x]], {x, 0, nmax}], x]*Range[0, nmax]!][[1 ;; -1 ;; 2]] (* G. C. Greubel, Jul 21 2018 *)
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PROG
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(PARI) x='x+O('x^60); v=Vec(serlaplace(cos(x*cosh(x)))); vector(#v\2, n, v[2*n-1]) \\ G. C. Greubel, Jul 21 2018
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CROSSREFS
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KEYWORD
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sign
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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