Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #4 Mar 31 2012 12:35:10
%S 1,1,1,1,1,7,21,55,263,1645,13423,126629,1447199,21743065,415978809,
%T 9965909653,303132585251,11591760284391,555704916934105,
%U 33613901189599473,2574475177790739409
%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 1100-0111-0100 pattern in any orientation.
%e Maximal 8 X 8 example
%e .0.0.0.0.1.1.0.0
%e .0.0.1.1.1.0.0.0
%e .0.1.0.0.1.0.0.1
%e .0.1.0.0.0.1.1.1
%e .1.1.1.0.0.0.1.0
%e .1.0.0.1.0.0.1.0
%e .0.0.0.1.1.1.0.0
%e .0.0.1.1.0.0.0.0
%K nonn
%O 1,6
%A _R. H. Hardin_