%I A145928
%S A145928 1,1,1,3,10,33,134,947,8780,97821,1375312,27712816,754977953,
%T A145928 26645291289,1208294585650,74271003442168,6124346294290730,
%U A145928 668846422203976047,95426817845827533968,18141398847837127162392
%N A145928 Number of n X n binary arrays symmetric about main diagonal with all 
               ones connected only in a tee 1,1 1,2 1,3 2,2 in any orientation.
%e A145928 Maximal 8 X 8 example
%e A145928 .0.0.0.1.0.0.0.1
%e A145928 .0.0.1.1.0.0.1.1
%e A145928 .0.1.0.1.0.0.0.1
%e A145928 .1.1.1.0.1.1.1.0
%e A145928 .0.0.0.1.0.1.0.1
%e A145928 .0.0.0.1.1.0.1.1
%e A145928 .0.1.0.1.0.1.0.1
%e A145928 .1.1.1.0.1.1.1.0
%Y A145928 Sequence in context: A149029 A149030 A149031 this_sequence A006535 A041633 
               A034215
%Y A145928 Adjacent sequences: A145925 A145926 A145927 this_sequence A145929 A145930 
               A145931
%K A145928 nonn
%O A145928 1,4
%A A145928 Ron Hardin (rhhardin(AT)att.net), Oct 25 2008