A147146 - OEIS

A147146

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1100-0110-0011 pattern in any orientation.

%I #4 Mar 31 2012 12:35:15

%S 1,1,1,1,3,9,19,67,271,1339,7503,48863,386667,3842993,45897369,

%T 657696677

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1000-1100-0110-0011 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.1.1.0.0.0.0

%e .0.1.1.0.0.0.0.1

%e .1.1.0.0.0.0.1.1

%e .1.0.1.1.0.1.1.0

%e .0.1.1.0.1.1.0.1

%e .1.1.0.0.0.0.1.1

%e .1.0.0.0.0.1.1.0

%e .0.0.0.0.1.1.0.0

%K nonn

%O 1,5

%A _R. H. Hardin_, Nov 04 2008