A146664 - OEIS

A146664

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0001 pattern in any orientation.

%I #4 Mar 31 2012 12:35:11

%S 1,1,1,1,1,1,3,19,43,87,303,1077,3757,15681,80673,475263,2975253,

%T 20229343,160250909,1366441107,13345035623

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-0111-0001 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.1.1.0

%e .1.0.0.1.1.1.0.0

%e .1.1.0.1.0.0.0.0

%e .0.1.0.0.0.1.1.0

%e .0.1.1.0.0.0.1.0

%e .0.0.0.0.1.0.1.1

%e .0.0.1.1.1.0.0.1

%e .0.1.1.0.0.0.0.0

%K nonn

%O 1,7

%A _R. H. Hardin_, Nov 04 2008