A146654 - OEIS

A146654

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0100-1111 pattern in any orientation.

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

%S 1,1,1,1,1,1,1,3,7,15,33,67,183,469,1433,5417,21723,100185,477751,

%T 2441485,14323245,87372485

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0100-1111 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.1.1.1.1.0

%e .0.0.0.0.1.0.0.1

%e .0.0.0.1.1.0.0.1

%e .1.0.1.0.0.1.1.1

%e .1.1.1.0.0.1.0.1

%e .1.0.0.1.1.0.0.0

%e .1.0.0.1.0.0.0.0

%e .0.1.1.1.1.0.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_, Nov 04 2008