%I #3 Mar 31 2012 12:35:07
%S 1,2,10,44,510,5224,141884,3412572,218142282,12364138164,
%T 1864646386404,249526282773960,88904892606631308,28120381445675195736,
%U 23690799052839367018340
%N 1/3 of the number of 3-colorings of an n X n array symmetric under 180 degree rotation.
%K nonn
%O 1,2
%A _R. H. Hardin_, Oct 05 2008