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%I #3 Mar 31 2012 12:35:09
%S 1,1,3,7,17,57,295,1823,12191,109351,1406131,21111023,390067193,
%T 9744306045,307351023911,11997000829617,605954154512379,
%U 39113863932012429,3182367148757620917,330528821610534812877
%N Number of n X n binary arrays symmetric about main diagonal with all ones connected only in an em 1,1 1,2 2,2 2,3 3,3 in any orientation.
%e Maximal 8 X 8 example
%e .0.1.1.0.1.1.0.1
%e .1.1.0.1.1.0.1.1
%e .1.0.0.1.0.1.1.0
%e .0.1.1.0.0.0.0.0
%e .1.1.0.0.0.1.1.0
%e .1.0.1.0.1.1.0.1
%e .0.1.1.0.1.0.1.1
%e .1.1.0.0.0.1.1.0
%K nonn
%O 1,3
%A _R. H. Hardin_, Oct 27 2008
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