A146782 - OEIS

A146782

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0010-1010-1111 pattern in any orientation.

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

%S 1,1,1,1,1,13,49,239,1173,4715,31587,301011,3297233,42878373,

%T 733059585,14504194097

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0010-1010-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .1.1.1.1.0.0.0.0

%e .1.0.1.0.0.0.1.1

%e .0.0.1.0.0.0.0.1

%e .1.0.0.0.0.1.1.1

%e .1.1.1.0.0.0.0.1

%e .1.0.0.0.0.1.0.0

%e .1.1.0.0.0.1.0.1

%e .0.0.0.0.1.1.1.1

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008