OFFSET
2,1
FORMULA
a(n) ~ n^(2*n^2 - n + 1/2) / (2 * exp(n*(n-1))). - Vaclav Kotesovec, Oct 26 2017
MATHEMATICA
Table[(n^2)!/(2(n!)), {n, 2, 6}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Jan 16 2007
STATUS
approved