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Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0100-1100-0111-0010 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:14

%S 1,1,1,1,1,1,1,1,3,3,5,5,13,13,29,29,101,101,469,469,2569,2569,14457,

%T 14457,96029,96029,884501,884501,9747473

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0100-1100-0111-0010 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.1.0.0.0.1.0.0

%e .0.0.1.1.0.1.1.0.0

%e .1.1.1.0.0.0.1.1.1

%e .0.1.0.0.0.0.0.1.0

%e .0.0.0.0.0.0.0.0.0

%e .0.1.0.0.0.0.0.1.0

%e .1.1.1.0.0.0.1.1.1

%e .0.0.1.1.0.1.1.0.0

%e .0.0.1.0.0.0.1.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_, Nov 04 2008