OFFSET
0,2
FORMULA
a(0) = 1; a(n) = 2*a(n-1) + n^n.
a(n) ~ n^n. - Vaclav Kotesovec, Jan 13 2024
PROG
(PARI) a(n) = sum(k=0, n, k^k*2^(n-k));
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Seiichi Manyama, Dec 29 2023
STATUS
approved