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A146388 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0110-1111 pattern in any orientation. 0

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

%S 1,1,1,1,9,20,73,328,1655,10746,103583,974458,13360226,192146495,

%T 4002035013,89158887545,2840078369454

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0110-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.1.1.0.1.1.1.1

%e .1.1.1.1.0.1.1.0

%e .0.0.0.0.0.0.0.0

%e .0.1.1.0.1.1.1.1

%e .1.1.1.1.0.1.1.0

%e .0.0.0.0.0.0.0.0

%e .0.1.1.0.1.1.1.1

%e .1.1.1.1.0.1.1.0

%K nonn

%O 1,5

%A _R. H. Hardin_

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Last modified April 19 10:38 EDT 2024. Contains 371791 sequences. (Running on oeis4.)