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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:09

%S 1,1,1,1,1,3,13,33,61,183,597,2481,11129,55369,260691,1725489,

%T 11211005,97261999,792491905,8327148961,84267555083,1143224998469

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.1.1.0.0

%e .0.0.0.0.1.1.0.0

%e .1.1.1.1.0.1.0.0

%e .1.1.0.0.0.1.0.0

%e .0.0.1.0.0.0.1.1

%e .0.0.1.0.1.1.1.1

%e .0.0.1.1.0.0.0.0

%e .0.0.1.1.0.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_