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 1,1,1,1,1,1,2,1,4,1,8,3,26,9,95,20,374,59,1990,238,12488,1339,98678,
%T 8950,945523,63227,10649014,541368,148952527
%N Number of n X n binary arrays symmetric about the diagonal and under 90 degree rotation with all ones connected only in a 110-111-110 pattern in any orientation.
%e Maximal 9 X 9 example
%e .0.0.0.0.1.0.0.0.0
%e .0.0.0.1.1.1.0.0.0
%e .0.0.0.1.1.1.0.0.0
%e .0.1.1.0.0.0.1.1.0
%e .1.1.1.0.0.0.1.1.1
%e .0.1.1.0.0.0.1.1.0
%e .0.0.0.1.1.1.0.0.0
%e .0.0.0.1.1.1.0.0.0
%e .0.0.0.0.1.0.0.0.0
%K nonn
%O 1,7
%A _R. H. Hardin_