Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
%I #4 Mar 31 2012 12:35:09
%S 1,1,1,1,3,9,20,59,238,1339,8950,63227,541368,5931901,82015459,
%T 1400527040,28248253548,677346206953,19987158806408,732068950428064,
%U 33003291678037712,1801673455589720405,118568477345258796542
%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in a 110-111-110 pattern in any orientation.
%e Maximal 8 X 8 example
%e .0.0.0.1.1.0.0.0
%e .0.0.1.1.1.0.0.0
%e .0.1.0.1.1.0.0.0
%e .1.1.1.0.0.0.1.1
%e .1.1.1.0.0.1.1.1
%e .0.0.0.0.1.0.1.1
%e .0.0.0.1.1.1.0.0
%e .0.0.0.1.1.1.0.0
%K nonn
%O 1,5
%A _R. H. Hardin_