A147503 - OEIS

A147503

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0110-0111 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,7,19,33,55,139,371,947,2907,11335

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0110-0111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.0.0.0.0.1.1.1

%e .1.1.1.0.0.1.1.0

%e .1.1.1.0.1.1.1.0

%e .0.0.1.0.0.0.0.0

%e .0.0.0.0.0.1.0.0

%e .0.1.1.1.0.1.1.1

%e .0.1.1.0.0.1.1.1

%e .1.1.1.0.0.0.0.1

%K nonn

%O 1,8

%A _R. H. Hardin_