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A146450 Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0110-0011 pattern in any orientation. 0

%I #4 Mar 31 2012 12:35:10

%S 1,1,1,1,1,1,1,1,1,1,3,3,7,7,15,15,49,49,233,233,1205,1205,7091,7091,

%T 56369,56369,554977,554977,6653663,6653663

%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 1100-0110-0011 pattern in any orientation.

%e Maximal 11 X 11 example

%e .0.0.1.0.0.0.0.0.1.0.0

%e .0.0.1.1.0.0.0.1.1.0.0

%e .1.1.0.1.1.0.1.1.0.1.1

%e .0.1.1.0.1.0.1.0.1.1.0

%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 .0.1.1.0.1.0.1.0.1.1.0

%e .1.1.0.1.1.0.1.1.0.1.1

%e .0.0.1.1.0.0.0.1.1.0.0

%e .0.0.1.0.0.0.0.0.1.0.0

%K nonn

%O 1,11

%A _R. H. Hardin_

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Last modified April 18 18:58 EDT 2024. Contains 371781 sequences. (Running on oeis4.)