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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1110-1111 pattern in any orientation.
0

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

%S 1,1,1,1,3,13,35,153,683,3961,40313,425869,5201531,83958899,

%T 1605656621,40845335121,1341029021439,52952035760711,2606494713905651,

%U 160683571908609159

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1110-1111 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 .0.0.0.1.1.0.0.0

%e .1.1.1.0.1.0.1.1

%e .1.1.1.1.0.0.1.1

%e .0.0.0.0.0.0.1.1

%e .0.0.0.1.1.1.0.1

%e .0.0.0.1.1.1.1.0

%K nonn

%O 1,5

%A _R. H. Hardin_, Nov 04 2008