OFFSET
0,4
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..505
FORMULA
a(n) = n! * Sum_{k=0..floor(n/3)} (-k)^(n-3*k)/(k! * (n-3*k)!). - Seiichi Manyama, Jul 10 2022
PROG
(PARI) x='x+O('x^66); Vec(serlaplace(exp(x^3*exp(-x))))
(PARI) a(n) = n!*sum(k=0, n\3, (-k)^(n-3*k)/(k!*(n-3*k)!)); \\ Seiichi Manyama, Jul 10 2022
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Sep 26 2017
STATUS
approved