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 A333460 #12 Jun 03 2020 05:27:11 %S A333460 8,172,1864,9396,28188,72688,153240,269680,500344,795344,1158752, %T A333460 1820428,2506948,3477052,4772708,6313892,8116916,10200156,13320308, %U A333460 16199876,20189488,24692976,28950448,36096712,41795388,49216724,58997920 %N A333460 Number of edges in an diagonal-edged (or diamond-shaped) checkerboard with width and height 2*n-1 (see Comments in A333434 for definition). %C A333460 See A333434 for the definition and images of the checkerboard. %Y A333460 Cf. A333434 (regions), A333458 (n-gons), A333459 (vertices), A333027, A333036, A333283. %K A333460 nonn,more %O A333460 1,1 %A A333460 _Scott R. Shannon_ and _N. J. A. Sloane_, Mar 22 2020 %E A333460 a(8)-a(27) from _Lars Blomberg_, Jun 03 2020