OFFSET
0,3
COMMENTS
The next term has 126 digits.
FORMULA
a(n) ~ A^n * n^(1/4 + 13*n/12 + n^2 + n^3) * (2*Pi)^(1/4 + n/2) / exp(n*(2 + 2*n + 3*n^2)/4), where A = A074962 is the Glaisher-Kinkelin constant.
MATHEMATICA
Table[Product[(k*n)!, {k, 0, n}], {n, 0, 6}]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vaclav Kotesovec, Apr 20 2016
STATUS
approved