A146794 - OEIS

A146794

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

%I #4 Mar 31 2012 12:35:13

%S 1,1,1,1,1,5,17,41,145,657,4553,32425,257569,2670753,36201945,

%T 564616361,10290347089,235475912465,6833463711081,238928359316057,

%U 9863518167137825

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

%e Maximal 8 X 8 example

%e .0.0.1.1.1.1.0.0

%e .0.0.0.1.0.0.0.0

%e .1.0.0.1.1.0.0.1

%e .1.1.1.0.0.1.0.1

%e .1.0.1.0.0.1.1.1

%e .1.0.0.1.1.0.0.1

%e .0.0.0.0.1.0.0.0

%e .0.0.1.1.1.1.0.0

%K nonn

%O 1,6

%A _R. H. Hardin_, Nov 04 2008