A146449 - OEIS

A146449

Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0110-0011 pattern in any orientation.

%I #4 Mar 31 2012 12:35:10

%S 1,1,1,1,1,1,1,3,7,13,37,103,247,705,2637,10751,47763,249479,1432497,

%T 8448903,55396711,408864319,3345198367,30485497915,317358146063,

%U 3656304314307,46486480051999,650411725511243

%N Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 1100-0110-0011 pattern in any orientation.

%e Maximal 8 X 8 example

%e .0.0.0.0.0.1.1.0

%e .0.0.0.0.1.1.0.1

%e .0.0.0.1.1.0.1.1

%e .0.0.1.0.0.1.1.0

%e .0.1.1.0.0.1.0.0

%e .1.1.0.1.1.0.0.0

%e .1.0.1.1.0.0.0.0

%e .0.1.1.0.0.0.0.0

%K nonn

%O 1,8

%A _R. H. Hardin_