%I #5 Mar 30 2012 16:49:12
%S 1,6,180,873600,772107033600
%N A036981(n)/n!^2.
%H <a href="/index/To#tournament">Index entries for sequences related to tournaments</a>
%K nonn,hard
%O 0,2
%A _N. J. A. Sloane_, Dec 01 2001