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A146661 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0001 pattern in any orientation. 0

%I

%S 1,1,1,1,3,9,23,67,379,2563,18843,171357,2142397,34085501,656314291,

%T 15909337201,492190457043,19216875516479,939930272232161

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0001 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.1.0.0.0.0

%e .0.0.0.1.0.0.0.1

%e .1.0.0.1.1.0.1.1

%e .1.1.1.0.1.0.1.0

%e .0.0.1.1.0.1.1.0

%e .0.0.0.0.1.0.0.0

%e .0.0.1.1.1.0.0.0

%e .0.1.1.0.0.0.0.0

%K nonn

%O 1,5

%A _R. H. Hardin_, Nov 04 2008

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Last modified August 16 16:08 EDT 2022. Contains 356169 sequences. (Running on oeis4.)