A147222 - OEIS

A147222

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0101 pattern in any orientation.

%I #4 Mar 31 2012 12:35:16

%S 1,1,1,1,1,21,45,251,1189,5949,38111,398367,3732199

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1100-0111-0101 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.1.0.1.0

%e .1.1.0.0.1.1.1.0

%e .0.1.0.0.0.0.1.1

%e .1.1.1.0.0.1.0.0

%e .0.0.1.0.0.1.1.1

%e .1.1.0.0.0.0.1.0

%e .0.1.1.1.0.0.1.1

%e .0.1.0.1.0.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008