OFFSET
0,3
FORMULA
E.g.f: Sum_{k>=0} x^k / (k! * (1 - k^2 * x)).
PROG
(PARI) a(n) = n!*sum(k=0, n, k^(2*(n-k))/k!);
(PARI) my(N=20, x='x+O('x^N)); Vec(serlaplace(sum(k=0, N, x^k/(k!*(1-k^2*x)))))
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Aug 22 2022
STATUS
approved