A146924 - OEIS

A146924

Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0110-1111-0110 pattern in any orientation.

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

%S 1,1,1,1,1,5,13,32,116,329,1343,7578,43263,292424,2337772,20731810,

%T 226646472,2872512529,41869404152,707811350778,14078518669729,

%U 324770949354296

%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0110-1111-0110 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.1.1.0.0.0

%e .0.0.1.1.1.1.0.0

%e .0.1.0.1.1.0.1.0

%e .1.1.1.0.0.1.1.1

%e .0.1.0.1.1.0.1.0

%e .0.0.1.1.1.1.0.0

%e .0.0.0.1.1.0.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008