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 A028926 #6 Jul 08 2025 18:56:24 %S A028926 0,1,3,6,12,20,36,46,66,90,138,216,378,459,616,873,1645,2133 %N A028926 Number of pairs of minimal vectors in n-dimensional lattice Kappa_n. %D A028926 J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 161. %Y A028926 A028923 / 2. %K A028926 nonn %O A028926 0,3 %A A028926 _N. J. A. Sloane_