OFFSET
0,3
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..649
FORMULA
a(n) = a(n-1) - 5*(n-1)*a(n-2) for n > 1.
a(n) = n! * Sum_{k=0..floor(n/2)} (-5/2)^k / (k! * (n-2*k)!).
PROG
(PARI) my(N=30, x='x+O('x^N)); Vec(serlaplace(exp(x-5*x^2/2)))
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Seiichi Manyama, Apr 13 2023
STATUS
approved