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 A125561 #5 Mar 30 2012 16:50:36
%S A125561 1,0,0,20,30,0,0,60,90,0,0,180,140,0,0,132,270,0,0,420,360,0,0,360,
%T A125561 330,0,0,560,660,0,0,540,810,0,0,1080,570,0,0,480,1020,0,0,1500,1260,
%U A125561 0,0,1080,1100,0,0,1320,1560,0,0,1320,1620,0,0,2340,1452,0,0,1140,2190,0,0,2940
%N A125561 Theta series of 5-dimensional lattice A_5^{+2}.
%D A125561 J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices I: Quadratic Forms of Small Determinant, Proc. Royal Soc. London, Series A, 418 (1988), 17-41.
%D A125561 J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, p. 110.
%H A125561 John Cannon, <a href="/A125561/b125561.txt">Table of n, a(n) for n = 0..10000</a>
%e A125561 1 + 20*q^3 + 30*q^4 + 60*q^7 + 90*q^8 + 180*q^11 + 140*q^12 + 132*q^15 + ...
%K A125561 nonn
%O A125561 0,4
%A A125561 _N. J. A. Sloane_, Jan 31 2007