A146590 - OEIS

A146590

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-1111-0100 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,5,13,25,41,73,405,2087,9095,31781,109905,706437,

%T 6193961,52066515,395176419,2801856537,27230658787

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 0110-1111-0100 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.1.0.0.0

%e .0.0.1.1.1.1.0.0

%e .0.1.0.1.1.0.1.0

%e .0.1.1.0.0.1.1.1

%e .1.1.1.0.0.1.1.0

%e .0.1.0.1.1.0.1.0

%e .0.0.1.1.1.1.0.0

%e .0.0.0.1.0.0.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_, Nov 04 2008