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Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0010-0010 pattern in any orientation.
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%I #4 Mar 31 2012 12:35:15

%S 1,1,1,1,1,3,11,27,57,269,1741,11383,71261,614161,7140843,99666239,

%T 1560593149,29491532325,702793762267,20557975075647

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1111-0010-0010 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.1.0

%e .0.0.0.0.1.1.1.0

%e .0.0.0.0.0.0.1.0

%e .0.0.0.0.0.0.1.1

%e .0.1.0.0.0.0.0.0

%e .0.1.0.0.0.0.0.0

%e .1.1.1.1.0.0.0.0

%e .0.0.0.1.0.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008