OFFSET
0,2
FORMULA
a(n) ~ 2^(n^2 + n/2 + 1/12) * n^(n*(n+1)) / exp(n^2/2 - 1/12).
MATHEMATICA
Table[Product[(k^2 + n^2)^k, {k, 1, n}], {n, 0, 10}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Vaclav Kotesovec, Dec 05 2023
STATUS
approved