OFFSET
1,2
COMMENTS
Integers in this sequence are <= (n!)^2 (see A001044)
FORMULA
a(n) = Round[2 Pi n^(2 n + 1)E^(-2 n)]
MATHEMATICA
Table[Round[N[2 Pi n^(2 n + 1)E^(-2 n)]], {n, 1, 30}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Artur Jasinski, Oct 22 2007
STATUS
approved