%I #4 Mar 31 2012 12:35:17
%S 1,1,1,1,1,3,7,15,29,107,505,2403,11235,68883,550857,5140463,52360741,
%T 625116575,9135765233,158905603757,3203687852735,75422308943617
%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1000-1110-0111-0001 pattern in any orientation.
%e Maximal 8 X 8 example
%e .0.0.0.0.0.0.0.0
%e .0.0.0.0.0.0.0.0
%e .0.0.0.0.1.0.0.0
%e .0.0.0.0.1.1.1.0
%e .0.0.1.1.0.1.1.1
%e .0.0.0.1.1.0.0.1
%e .0.0.0.1.1.0.0.0
%e .0.0.0.0.1.1.0.0
%K nonn
%O 1,6
%A _R. H. Hardin_