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 A033725 #9 Oct 06 2018 11:44:13 %S A033725 1,2,0,0,2,0,0,0,0,2,0,0,0,2,4,0,2,4,0,0,0,0,4,0,0,2,0,0,0,4,0,0,0,0, %T A033725 0,0,2,0,4,0,0,0,0,0,0,0,0,0,0,6,0,0,2,4,0,0,4,0,0,0,0,4,4,0,2,0,0,0, %U A033725 4,0,0,0,0,0,0,0,0,8,0,0,0 %N A033725 Product theta3(q^d); d | 13. %D A033725 J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p 102 eq 9. %H A033725 Seiichi Manyama, <a href="/A033725/b033725.txt">Table of n, a(n) for n = 0..10000</a> %K A033725 nonn %O A033725 0,2 %A A033725 _N. J. A. Sloane_