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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 1,1,1,1,1,13,27,135,531,2573,17743,176473,1599401,23234641,323134671,
%T 6982586189,150620917453,4817580729223,154870862911911
%N Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0100-1111-0010 pattern in any orientation.
%e Maximal 8 X 8 example
%e .0.0.0.0.0.1.0.0
%e .0.0.0.0.1.1.1.1
%e .0.1.0.0.0.0.1.0
%e .1.1.1.1.0.1.0.0
%e .0.0.1.0.1.1.1.1
%e .0.1.0.0.0.0.1.0
%e .1.1.1.1.0.0.0.0
%e .0.0.1.0.0.0.0.0
%K nonn
%O 1,6
%A _R. H. Hardin_