OFFSET
1,1
FORMULA
a(n) ~ 2^n * n^(3*n). - Vaclav Kotesovec, Dec 20 2014
MATHEMATICA
Table[Sum[k^(n+k)*(n+k)^k, {k, 0, n}], {n, 1, 12}]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vaclav Kotesovec, Dec 20 2014
STATUS
approved