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 A358950 #6 Dec 19 2022 13:31:51 %S A358950 3,21,375,2574,22083,52791,279750,673050,1851816,3272058,9865560, %T A358950 14592537 %N A358950 Number of edges formed inside a triangle with edge length 1 by the straight line segments mutually connecting all vertices and points that divide the sides into segments with lengths equal to the Farey series of order n = A006842(n,k)/A006843(n,k), k = 1..A005728(n). %C A358950 The number of points along each edge is given by A005728(n). %C A358950 See A358948 and A358949 for images of the square. %H A358950 Wikipedia, <a href="https://en.wikipedia.org/wiki/Farey_sequence">Farey sequence</a>. %F A358950 a(n) = A358948(n) + A358949(n) - 1 by Euler's formula. %Y A358950 Cf. A358948 (regions), A358949 (vertices), A358951 (k-gons), A358888, A006842, A006843, A005728, A358882. %K A358950 nonn,more %O A358950 1,1 %A A358950 _Scott R. Shannon_ and _N. J. A. Sloane_, Dec 07 2022