OFFSET
1,2
FORMULA
a(n) ~ A * n^(n^2 + n + 1/12) / exp((n^2 + 2*n + 3)/4), where A = A074962 is the Glaisher-Kinkelin constant.
MATHEMATICA
Table[Product[(k*n-k)^k, {k, 1, n}], {n, 1, 10}]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vaclav Kotesovec, Apr 21 2016
STATUS
approved