OFFSET
0,3
LINKS
G. C. Greubel, Table of n, a(n) for n = 0..449
MAPLE
a:=series(cosh(x^2/2)/(1-x), x=0, 21): seq(n!*coeff(a, x, n), n=0..20); # Paolo P. Lava, Mar 27 2019
MATHEMATICA
With[{nn=30}, CoefficientList[Series[Cosh[x^2/2]/(1-x), {x, 0, nn}], x] Range[0, nn]!] (* Harvey P. Dale, May 01 2012 *)
PROG
(PARI) {a(n) = if( n<0, 0, n! * polcoeff( cosh( x^2 / 2 + x * O(x^n)) / (1 - x), n))}
(Magma) m:=30; R<x>:=PowerSeriesRing(Rationals(), m); b:=Coefficients(R!(Cosh(x^2/2)/(1-x))); [Factorial(n-1)*b[n]: n in [1..m]]; // G. C. Greubel, Aug 13 2018
CROSSREFS
KEYWORD
nonn
AUTHOR
Michael Somos, Jul 24 2011
STATUS
approved