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1/3 of the number of 3-colorings of an n X n array symmetric under 180 degree rotation.
0

%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