%I A037187
%S A037187 0,0,0,1,0,2,10,7,7,13,30,33,82,61,283,189,282,328,594,675,2413,
%T A037187 1248,3968,2852,8983
%N A037187 Number of ways of placing 2n points on n X n grid so no 3 are in a line 
               (solutions with 180 deg rotational symmetry).
%D A037187 A. Flammenkamp, Progress in the no-three-in-line problem, J. Combinat. 
               Theory A 60 (1992), 305-311.
%D A037187 A. Flammenkamp, Progress in the no-three-in-line problem. II. J. Combin. 
               Theory Ser. A 81 (1998), no. 1, 108-113.
%H A037187 A. Flammenkamp, <a href="http://wwwhomes.uni-bielefeld.de/achim/no3in/
               table.txt">Solutions of the no-three-in-line problem</a>
%Y A037187 Cf. A000769.
%Y A037187 Sequence in context: A076374 A142954 A082225 this_sequence A166542 A092939 
               A006610
%Y A037187 Adjacent sequences: A037184 A037185 A037186 this_sequence A037188 A037189 
               A037190
%K A037187 nonn
%O A037187 1,6
%A A037187 N. J. A. Sloane (njas(AT)research.att.com).
%E A037187 There are published versions of this sequence which incorrectly give 
               693 instead of 675.