OFFSET
0,5
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..487
FORMULA
a(n) = n! * Sum_{k=0..floor(n/4)} (-k)^(n-4*k)/(k! * (n-4*k)!). - Seiichi Manyama, Jul 10 2022
MAPLE
S:= series(exp(x^4*exp(-x)), x, 51):
seq(coeff(S, x, j)*j!, j=0..50); # Robert Israel, Sep 28 2017
PROG
(PARI) x='x+O('x^66); Vec(serlaplace(exp(x^4*exp(-x))))
(PARI) a(n) = n!*sum(k=0, n\4, (-k)^(n-4*k)/(k!*(n-4*k)!)); \\ Seiichi Manyama, Jul 10 2022
CROSSREFS
KEYWORD
sign
AUTHOR
Seiichi Manyama, Sep 27 2017
STATUS
approved