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 A033727 #9 Oct 06 2018 11:44:27 %S A033727 1,2,0,2,6,2,4,4,4,14,0,0,14,4,4,2,10,12,12,16,6,28,8,12,48,2,8,38,20, %T A033727 12,4,16,40,48,8,4,66,4,8,52,4,36,28,28,16,14,12,36,106,18,0,60,28,12, %U A033727 40,0,52,64,16,24,14,28,16,100 %N A033727 Product theta3(q^d); d | 15. %D A033727 J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p 102 eq 9. %H A033727 Seiichi Manyama, <a href="/A033727/b033727.txt">Table of n, a(n) for n = 0..10000</a> %K A033727 nonn %O A033727 0,2 %A A033727 _N. J. A. Sloane_