%I #5 Mar 30 2012 18:38:51
%S 2,4480,6829776306569216000000,
%T 476828881356392543041592797163461605193984896811956028519492400892855796105719316480000000000000000000
%N a(n)=(3^n)!/3^(floor(3^n/2)).
%C 3^(floor(3^n/2)) is the highest power of 3 dividing (3^n)!
%K nonn
%O 1,1
%A _Benoit Cloitre_, Feb 04 2002