%I #4 Mar 31 2012 12:35:17
%S 1,1,1,3,5,9,19,55,245,1021,4107,20679,138093,1077295,9543083,
%T 95957809,1121795793,15620825665,256368054863,4898555273539,
%U 109719649027999,2878513446258779,87946594793312351
%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation.
%e Maximal 8 X 8 example
%e .0.0.1.0.0.0.1.1
%e .0.0.1.0.1.1.1.1
%e .1.1.1.1.0.0.1.0
%e .0.0.1.1.0.0.1.0
%e .0.1.0.0.1.1.0.0
%e .0.1.0.0.1.1.1.1
%e .1.1.1.1.0.1.0.0
%e .1.1.0.0.0.1.0.0
%K nonn
%O 1,4
%A _R. H. Hardin_
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