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A147470 Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation. 0

%I

%S 1,1,1,3,5,9,19,55,245,1021,4107,20679,138093,1077295,9543083,

%T 95957809,1121795793,15620825665,256368054863,4898555273539,

%U 109719649027999,2878513446258779,87946594793312351

%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.0.0.0.1.1

%e .0.0.1.0.1.1.1.1

%e .1.1.1.1.0.0.1.0

%e .0.0.1.1.0.0.1.0

%e .0.1.0.0.1.1.0.0

%e .0.1.0.0.1.1.1.1

%e .1.1.1.1.0.1.0.0

%e .1.1.0.0.0.1.0.0

%K nonn

%O 1,4

%A _R. H. Hardin_

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Last modified August 9 05:53 EDT 2022. Contains 356016 sequences. (Running on oeis4.)