This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A037188 #11 Jul 08 2025 22:04:01 %S A037188 0,0,1,1,0,2,0,0,0,1,0,2,1,3,1,1,0,2,0,2,0,1,1,2,2,0,0,0,1,1,2,1,0,0, %T A037188 1,1,0,1,0,0,0,1,0,1,0 %N A037188 Number of ways of placing 2n points on n X n grid so no 3 are in a line (solutions with symmetry about both main diagonals). %H A037188 A. Flammenkamp, <a href="http://wwwhomes.uni-bielefeld.de/achim/no3in/table_old.txt">Solutions of the no-three-in-line problem</a> %H A037188 A. Flammenkamp, <a href="http://wwwhomes.uni-bielefeld.de/achim/no3in/table.txt">Solutions of the no-three-in-line problem</a> %H A037188 A. Flammenkamp, <a href="https://doi.org/10.1016/0097-3165(92)90012-J">Progress in the no-three-in-line problem</a>, J. Combinat. Theory A 60 (1992), 305-311. %H A037188 A. Flammenkamp, <a href="https://doi.org/10.1006/jcta.1997.2829">Progress in the no-three-in-line problem. II</a>, J. Combin. Theory Ser. A 81 (1998), no. 1, 108-113. %Y A037188 Cf. A000769. %K A037188 nonn,more %O A037188 1,6 %A A037188 _N. J. A. Sloane_ %E A037188 More terms from Flammenkamp web site, May 24 2005