A145245 - OEIS

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A145245

1/5 of the number of 5-colorings of an n X n array symmetric under 180 degree rotation.

%I #3 Mar 31 2012 12:35:07

%S 1,4,172,7168,3254620,1429959400,6856279647904,31816048080263248,

%T 1611557504007762068188

%N 1/5 of the number of 5-colorings of an n X n array symmetric under 180 degree rotation.

%K nonn

%O 1,2

%A _R. H. Hardin_, Oct 05 2008