OFFSET
0,3
FORMULA
a(0) = 0; a(n) = n^3 * a(n-1) + n^3.
a(n) = n^3 * A217284(n-1) for n > 0.
PROG
(PARI) a(n) = n!^3*sum(k=0, n, (k/k!)^3);
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Seiichi Manyama, Jan 05 2024
STATUS
approved