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Number of symmetric n X n binary matrices with each element equal to one minus the sum of its horizontal and vertical neighbors, modulo two.
1

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

%S 1,1,1,4,2,1,1,1,16,1,8,1,1,4,1,16,2,1,256,1,1,1,128,4,1,1,1,1

%N Number of symmetric n X n binary matrices with each element equal to one minus the sum of its horizontal and vertical neighbors, modulo two.

%C A075462 is a(n) without the symmetry restriction.

%K nonn

%O 1,4

%A _R. H. Hardin_, Sep 16 2008