OFFSET
0,3
FORMULA
a(n) ~ exp(-1/2) * n^(2*n + 2).
MATHEMATICA
Table[Product[n^2 - k, {k, 0, n}], {n, 0, 15}]
Table[(n-1)*n*Pochhammer[1 - n + n^2, n], {n, 0, 15}]
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Vaclav Kotesovec, Apr 21 2016
STATUS
approved