OFFSET
0,3
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..376
FORMULA
a(n) = n! * Sum_{k=0..floor(n/3)} (n-k+1)^(n-2*k-1) / (k! * (n-3*k)!).
PROG
(PARI) a(n) = n!*sum(k=0, n\3, (n-k+1)^(n-2*k-1)/(k!*(n-3*k)!));
CROSSREFS
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Apr 24 2024
STATUS
approved