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%I #3 Mar 30 2012 16:49:52
%S 1,1,4,6,36,72,576,1440,14400,43200,518400,1814400,25401600,101606400,
%T 1625702400,7315660800,131681894400,658409472000,13168189440000,
%U 72425041920000,1593350922240000,9560105533440000,229442532802560000,1491376463216640000,38775788043632640000
%N A092186(n)/2.
%K nonn
%O 2,3
%A _N. J. A. Sloane_, Apr 02 2004