A146448 - OEIS

A146448

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

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

%S 1,1,1,1,3,7,15,49,233,1205,7091,56369,554977,6653663,98474615,

%T 1800719003,40485995917,1128941883627,39031781085873,1652786153476941

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

%e Maximal 8 X 8 example

%e .0.1.1.0.0.1.0.0

%e .1.0.1.1.0.1.1.0

%e .1.1.0.1.1.0.1.1

%e .0.1.1.0.0.1.0.1

%e .0.0.1.0.0.1.1.0

%e .1.1.0.1.1.0.1.1

%e .0.1.1.0.1.1.0.1

%e .0.0.1.1.0.1.1.0

%K nonn

%O 1,5

%A _R. H. Hardin_