A145247 - OEIS

%I #3 Mar 31 2012 12:35:08

%S 1,5,445,38945,61129245,94304065705,2610924486436445,

%T 71050577480317387425

%N 1/6 of the number of 6-colorings of an n X n array symmetric under 180 degree rotation.

%K nonn

%O 1,2

%A _R. H. Hardin_, Oct 05 2008