A146587 - OEIS

A146587

Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0110-1111-0100 pattern in any orientation.

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

%S 1,1,1,1,1,1,17,21,549,1019,12531,32807,1040313,3290973,362333049,

%T 1474237921,266711200491,1364122350485,428284962927597,

%U 2769561073160279,1886319046954861837,15405192560843785699,21883415341502162253677

%N Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0110-1111-0100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.0.0.0

%e .0.1.0.0.0.0.1.0

%e .1.1.0.0.0.0.1.1

%e .1.1.1.0.0.1.1.1

%e .0.1.0.0.0.0.1.0

%K nonn

%O 1,7

%A _R. H. Hardin_, Nov 04 2008