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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-0100 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:12

%S 1,1,1,1,1,21,47,295,1465,7767,65051,795933,8973805,164427495,

%T 3016356659,81769439115

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-1111-0100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.1.0.0.0.0

%e .0.0.1.1.1.1.0.0

%e .0.0.0.1.0.0.1.1

%e .0.1.0.0.1.1.1.1

%e .1.1.1.1.0.0.1.0

%e .1.1.0.0.1.0.0.0

%e .0.0.1.1.1.1.0.0

%e .0.0.0.0.1.1.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008