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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 12:35:11
%S 1,1,1,1,1,1,1,1,17,17,49,49,301,301,4891,4891,104131,104131,3555075,
%T 3555075,179509487,179509487,14641599949
%N Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 0110-1111-0100 pattern in any orientation.
%e Maximal 9 X 9 example
%e .0.0.0.0.0.0.0.0.0
%e .0.0.1.0.0.0.1.0.0
%e .1.1.1.1.0.1.1.1.1
%e .0.1.1.0.0.0.1.1.0
%e .0.0.0.0.0.0.0.0.0
%e .0.1.1.0.0.0.1.1.0
%e .1.1.1.1.0.1.1.1.1
%e .0.0.1.0.0.0.1.0.0
%e .0.0.0.0.0.0.0.0.0
%K nonn
%O 1,9
%A _R. H. Hardin_, Nov 04 2008