OFFSET
3,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 3..404
FORMULA
a(n) ~ (exp(-2) - exp(-3)) * 2^(n + 1/2) * n^n / exp(n). - Vaclav Kotesovec, Oct 25 2017
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Oct 19 2017
STATUS
approved