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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111 pattern in any orientation.
0

%I #4 Mar 31 2012 12:35:09

%S 1,1,1,1,3,13,37,183,817,5601,59649,681701,9890411,176577709,

%T 3939621645,118135623109,4491780681983,213414295100783,

%U 12753739646336971,960252990758480757,92263548659475375193

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.1.1.0.0.0

%e .0.0.0.1.1.0.0.0

%e .0.0.0.0.1.0.0.0

%e .1.1.0.0.1.0.1.1

%e .1.1.1.1.0.0.1.1

%e .0.0.0.0.0.0.0.1

%e .0.0.0.1.1.0.0.1

%e .0.0.0.1.1.1.1.0

%K nonn

%O 1,5

%A _R. H. Hardin_