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 A272364 #41 Oct 08 2018 02:52:37 %S A272364 1,4,4,2,14,24,8,12,44,36,8,24,50,40,24,16,50,96,28,12,112,96,24,48, %T A272364 104,68,56,50,60,168,40,12,188,144,32,48,182,104,72,76,88,240,48,60, %U A272364 240,168,48,96,230,124,84,64,196,312,80,48,312,264,56,120,160,200,120,60 %N A272364 Number of integer solutions to a^2 + b^2 + 3*c^2 + 4*d^2 = n. %C A272364 a(n) > 0 for n >= 0. %D A272364 J. H. Conway, Universal quadratic forms and the fifteen theorem, Contemporary Mathematics 272 (1999), 23-26. %H A272364 Seiichi Manyama, <a href="/A272364/b272364.txt">Table of n, a(n) for n = 0..10000</a> %F A272364 G.f.: theta_3(q)^2 * theta_3(q^3) * theta_3(q^4). %Y A272364 Cf. A034896, A320147, A320148. %K A272364 nonn %O A272364 0,2 %A A272364 _Seiichi Manyama_, Oct 06 2018