%I A146066
%S A146066 1,1,1,1,3,9,19,69,389,2287,15081,141721,1694175,23795099,418616469,
%T A146066 9434924199,264113682081,9153093458787,397472720900369,
%U A146066 21616544571284115,1466493314737915869,124160358455186794957
%N A146066 Number of n X n binary arrays symmetric about main diagonal with all 
               ones connected only in a 5-point zee 1,1 2,1 2,2 2,3 3,3 in any orientation.
%e A146066 Maximal 8 X 8 example
%e A146066 .0.0.1.1.0.1.1.0
%e A146066 .0.0.0.1.0.0.1.0
%e A146066 .1.0.0.1.1.0.1.1
%e A146066 .1.1.1.0.0.1.0.0
%e A146066 .0.0.1.0.0.1.1.1
%e A146066 .1.0.0.1.1.0.0.1
%e A146066 .1.1.1.0.1.0.0.0
%e A146066 .0.0.1.0.1.1.0.0
%Y A146066 Sequence in context: A147070 A130586 A147146 this_sequence A164283 A033315 
               A073716
%Y A146066 Adjacent sequences: A146063 A146064 A146065 this_sequence A146067 A146068 
               A146069
%K A146066 nonn
%O A146066 1,5
%A A146066 Ron Hardin (rhhardin(AT)att.net), Oct 26 2008