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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-1100 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:17

%S 1,1,1,1,1,9,21,73,310,1107,5232,33319,240772,2106289,21011261,

%T 262231181,3633528079,62517538899

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-1100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.1.0.0.0.0

%e .1.1.1.1.0.0.0.0

%e .0.0.1.1.0.0.1.1

%e .1.1.0.0.1.1.1.1

%e .1.1.1.1.0.0.1.1

%e .1.1.0.0.1.1.0.0

%e .0.0.0.0.1.1.1.1

%e .0.0.0.0.1.1.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_