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 A033721 #9 Oct 06 2018 11:43:46 %S A033721 1,2,0,2,6,0,0,4,0,4,4,0,10,16,0,0,14,0,4,4,0,16,8,0,0,14,0,2,20,0,8, %T A033721 4,0,0,4,0,12,32,0,8,20,0,0,12,0,16,8,0,26,14,0,0,32,0,0,8,0,24,12,0, %U A033721 0,32,0,8,30,0,8,12,0,0,8,0,20 %N A033721 Product theta3(q^d); d | 9. %D A033721 J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p 102 eq 9. %H A033721 Seiichi Manyama, <a href="/A033721/b033721.txt">Table of n, a(n) for n = 0..10000</a> %K A033721 nonn %O A033721 0,2 %A A033721 _N. J. A. Sloane_