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 A037189 #17 Dec 02 2018 04:08:17 %S A037189 0,0,3,4,6,4,13,13,7,16,8,23,36,58,92,101,172,281,337,541,746 %N A037189 Number of ways of placing 4n points on 2n X 2n grid so no 3 are in a line (solutions with either 90-degree rotational symmetry or full symmetry). %H A037189 A. Flammenkamp, <a href="http://dx.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 A037189 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. %H A037189 A. Flammenkamp, <a href="http://wwwhomes.uni-bielefeld.de/achim/no3in/table_old.txt">Solutions of the no-three-in-line problem</a> (Incorrect table!) %H A037189 A. Flammenkamp, <a href="http://wwwhomes.uni-bielefeld.de/achim/no3in/table.txt">Solutions of the no-three-in-line problem</a> %Y A037189 Cf. A000769. %K A037189 nonn,nice,more %O A037189 1,3 %A A037189 _N. J. A. Sloane_ %E A037189 More terms (from Flammenkamp) from _N. J. A. Sloane_, May 24 2005 %E A037189 Edited by _N. J. A. Sloane_, Aug 29 2008 at the suggestion of _R. J. Mathar_