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A147337 Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 01000-11100-00111-00010 pattern in any orientation. 0

%I #8 Mar 25 2016 06:49:27

%S 1,1,1,1,1,1,9,21,61,255,1001,4645,25381,168687,1415389

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 01000-11100-00111-00010 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.1.0

%e .0.0.0.0.0.0.1.1

%e .0.0.0.0.0.1.1.0

%e .0.0.1.0.1.1.0.0

%e .0.0.1.1.0.1.0.0

%e .0.1.1.0.0.0.0.0

%e .1.1.0.0.0.0.0.0

%e .0.1.0.0.0.0.0.0

%K nonn,more

%O 1,7

%A _R. H. Hardin_

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Last modified April 23 12:44 EDT 2024. Contains 371913 sequences. (Running on oeis4.)