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 A147343 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0100-0100-1111-0010-0010 pattern in any orientation. 0

%I

%S 1,1,1,1,1,1,1,1,1,1,1,1,1,1,3,3,9,9,19,19,39,39,125,125,481,481

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 0100-0100-1111-0010-0010 pattern in any orientation.

%e Maximal 15 X 15 example

%e .0.0.0.0.1.0.0.0.0.0.1.0.0.0.0

%e .0.0.0.0.1.0.0.0.0.0.1.0.0.0.0

%e .0.0.0.1.1.1.1.0.1.1.1.1.0.0.0

%e .0.0.1.0.0.1.0.0.0.1.0.0.1.0.0

%e .1.1.1.0.0.1.0.0.0.1.0.0.1.1.1

%e .0.0.1.1.1.0.0.0.0.0.1.1.1.0.0

%e .0.0.1.0.0.0.0.0.0.0.0.0.1.0.0

%e .0.0.0.0.0.0.0.0.0.0.0.0.0.0.0

%e .0.0.1.0.0.0.0.0.0.0.0.0.1.0.0

%e .0.0.1.1.1.0.0.0.0.0.1.1.1.0.0

%e .1.1.1.0.0.1.0.0.0.1.0.0.1.1.1

%e .0.0.1.0.0.1.0.0.0.1.0.0.1.0.0

%e .0.0.0.1.1.1.1.0.1.1.1.1.0.0.0

%e .0.0.0.0.1.0.0.0.0.0.1.0.0.0.0

%e .0.0.0.0.1.0.0.0.0.0.1.0.0.0.0

%K nonn

%O 1,15

%A _R. H. Hardin_

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Last modified November 28 17:10 EST 2022. Contains 358417 sequences. (Running on oeis4.)