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A146035 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation. 0

%I #3 Mar 31 2012 12:35:08

%S 1,1,1,1,1,1,3,3,7,7,15,15,39,39,189,189,995,995,5569,5569,37913,

%T 37913,366061,366061,4244909,4244909,58320195,58320195,974389263,

%U 974389263

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 3X3 el 1,1 1,2 1,3 2,3 3,3 in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.0.0.1.0.0

%e .0.0.1.0.0.1.0.0

%e .1.1.1.0.0.1.1.1

%e .0.0.0.0.0.0.0.0

%e .0.0.0.0.0.0.0.0

%e .1.1.1.0.0.1.1.1

%e .0.0.1.0.0.1.0.0

%e .0.0.1.0.0.1.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_, Oct 26 2008

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