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A146663 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0111-0001 pattern in any orientation. 0

%I

%S 1,1,1,1,1,1,1,1,1,1,3,3,9,9,23,23,67,67,379,379,2563,2563,18843,18843

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0111-0001 pattern in any orientation.

%e Maximal 11 X 11 example

%e .0.0.1.1.0.0.0.1.1.0.0

%e .0.0.0.1.0.0.0.1.0.0.0

%e .1.0.0.1.1.0.1.1.0.0.1

%e .1.1.1.0.1.0.1.0.1.1.1

%e .0.0.1.1.0.0.0.1.1.0.0

%e .0.0.0.0.0.0.0.0.0.0.0

%e .0.0.1.1.0.0.0.1.1.0.0

%e .1.1.1.0.1.0.1.0.1.1.1

%e .1.0.0.1.1.0.1.1.0.0.1

%e .0.0.0.1.0.0.0.1.0.0.0

%e .0.0.1.1.0.0.0.1.1.0.0

%K nonn

%O 1,11

%A _R. H. Hardin_, Nov 04 2008

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Last modified July 5 15:05 EDT 2022. Contains 355099 sequences. (Running on oeis4.)