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 A320201 #11 Oct 08 2018 02:51:17 %S A320201 1,2,2,4,4,4,8,8,6,6,8,4,8,14,4,12,20,16,18,28,24,20,36,24,16,30,32, %T A320201 16,32,28,16,36,30,32,32,56,28,36,52,24,56,40,24,20,40,32,32,48,40,42, %U A320201 50,56,42,64,52,64,48,40,80,28,60,80,52,52,44,80,40,108,88,32,100 %N A320201 Number of integer solutions to a^2 + 2*b^2 + 4*c^2 + 13*d^2 = n. %C A320201 a(n) > 0 for n >= 0. %H A320201 Seiichi Manyama, <a href="/A320201/b320201.txt">Table of n, a(n) for n = 0..10000</a> %F A320201 G.f.: theta_3(q) * theta_3(q^2) * theta_3(q^4) * theta_3(q^13). %Y A320201 Cf. A320193, A320194, A320195, A320196, A033720, A320197, A320198, A320199, A320200, A320202. %K A320201 nonn %O A320201 0,2 %A A320201 _Seiichi Manyama_, Oct 07 2018