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 A033733 #10 Oct 09 2018 10:55:09
%S A033733 1,2,0,2,6,0,0,6,4,2,4,12,6,4,8,0,10,0,0,16,8,6,4,12,4,14,8,2,34,12,4,
%T A033733 16,40,12,12,48,6,28,8,4,44,24,8,16,44,0,12,24,10,58,16,0,28,36,0,24,
%U A033733 100,16,16,48,8,28,16,6,62
%N A033733 Expansion of Product_{d | 21} theta_3(q^d).
%D A033733 J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p 102 eq 9.
%H A033733 Seiichi Manyama, <a href="/A033733/b033733.txt">Table of n, a(n) for n = 0..10000</a>
%H A033733 Michael Gilleland, <a href="/selfsimilar.html">Some Self-Similar Integer Sequences</a>
%K A033733 nonn
%O A033733 0,2
%A A033733 _N. J. A. Sloane_