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A009121
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Expansion of e.g.f. cosh(exp(x)*x).
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7
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1, 0, 1, 6, 25, 100, 481, 2954, 20721, 151848, 1146721, 9111982, 77652169, 710421452, 6891125697, 69961213170, 738718169569, 8108554524112, 92647353941569, 1101958783026134, 13616813607795321, 174287243264606388, 2304515271134124577, 31424734896799742170
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OFFSET
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0,4
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LINKS
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MAPLE
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a:= n-> add(`if`(k::odd, 0, binomial(n, k)*k^(n-k)), k=0..n):
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MATHEMATICA
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With[{nn=30}, CoefficientList[Series[Cosh[Exp[x]*x], {x, 0, nn}], x] Range[ 0, nn]!] (* Harvey P. Dale, Dec 28 2015 *)
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PROG
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(PARI) first(n) = x='x+O('x^n); Vec(serlaplace(cosh(exp(x)*x))) \\ Iain Fox, Dec 23 2017
(Magma) m:=30; R<x>:=PowerSeriesRing(Rationals(), m); b:=Coefficients(R!(Cosh(x*Exp(x)))); [Factorial(n-1)*b[n]: n in [1..m]]; // G. C. Greubel, Jul 26 2018
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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EXTENSIONS
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Definition clarified and prior Mathematica program replaced by Harvey P. Dale, Dec 28 2015
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STATUS
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approved
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