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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11100-00100-00111 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:16

%S 1,1,1,1,1,3,7,15,31,125,537,2497,11379,73403,564557,5044749,48150503,

%T 565823439,7944991263,131881718303,2468412664385

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 11100-00100-00111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .0.0.1.1.1.0.0.0

%e .0.1.0.0.1.0.0.0

%e .0.1.0.0.1.1.1.0

%e .0.1.1.1.0.0.0.0

%e .0.0.0.1.0.0.0.0

%e .0.0.0.1.0.0.0.0

%e .0.0.0.0.0.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008