A147443 - OEIS

A147443

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1010-1111-1010 pattern in any orientation.

%I #4 Mar 31 2012 12:35:17

%S 1,1,1,1,1,13,23,73,316,1171,5078,33627,212172,2092051,17868818,

%T 243014937,3050949895,53472938233

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 1010-1111-1010 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.1.0.1.0.0.1.0

%e .1.1.1.1.0.1.1.1

%e .0.1.0.1.0.0.1.0

%e .0.0.0.0.0.1.1.1

%e .1.1.1.0.0.0.0.0

%e .0.1.0.0.1.0.1.0

%e .1.1.1.0.1.1.1.1

%e .0.1.0.0.1.0.1.0

%K nonn

%O 1,6

%A _R. H. Hardin_