OFFSET
1,3
FORMULA
log(a(n)) ~ n*(3*log(n)- log(log(n)) - 1 - log(2) + (log(log(n)) + log(2) - 2) / (2*log(n))). - Vaclav Kotesovec, Nov 22 2021
MATHEMATICA
Table[Sum[k^(n+k)*(n-k)^k, {k, 0, n}], {n, 1, 15}]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vaclav Kotesovec, Dec 20 2014
STATUS
approved