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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 1000-1000-1100-0111 pattern in any orientation.
0

%I #4 Mar 31 2012 12:35:15

%S 1,1,1,1,1,1,1,1,3,3,7,7,15,15,33,33,93,93,429,429,2069,2069,10289,

%T 10289,55429,55429,387995,387995

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1000-1000-1100-0111 pattern in any orientation.

%e Maximal 9 X 9 example

%e .0.0.0.1.0.1.0.0.0

%e .0.0.0.1.0.1.0.0.0

%e .0.0.1.1.0.1.1.0.0

%e .1.1.1.0.0.0.1.1.1

%e .0.0.0.0.0.0.0.0.0

%e .1.1.1.0.0.0.1.1.1

%e .0.0.1.1.0.1.1.0.0

%e .0.0.0.1.0.1.0.0.0

%e .0.0.0.1.0.1.0.0.0

%K nonn

%O 1,9

%A _R. H. Hardin_, Nov 04 2008