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A146239 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-001 pattern in any orientation. 0

%I #4 Mar 31 2012 12:35:09

%S 1,1,1,1,9,41,201,1157,6733,60161,712733,11701425,239309475,

%T 6797981481,227189935315,9296498773239,488912114784905

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 110-111-001 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.1.1.0.0.1.1.0

%e .1.1.1.0.0.1.1.1

%e .1.0.0.0.1.0.0.1

%e .0.1.1.0.1.1.1.0

%e .0.1.1.1.0.1.1.0

%e .1.0.0.1.0.0.0.1

%e .1.1.1.0.0.1.1.1

%e .0.1.1.0.0.1.1.0

%K nonn

%O 1,5

%A _R. H. Hardin_

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Last modified April 19 16:52 EDT 2024. Contains 371794 sequences. (Running on oeis4.)