A146877 - OEIS

A146877

Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0100-0111 pattern in any orientation.

%I #4 Mar 31 2012 12:35:14

%S 1,1,1,1,1,1,1,13,37,65,121,421,1309,3649,15177,81237,474405,2569641,

%T 13240801,84039101,586237485

%N Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1110-0100-0111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.0.0.0.0.1.1.1

%e .1.0.1.0.0.1.0.0

%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 .0.0.1.0.0.1.0.1

%e .1.1.1.0.0.0.0.1

%K nonn

%O 1,8

%A _R. H. Hardin_, Nov 04 2008