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 A320196 #11 Oct 08 2018 05:37:17 %S A320196 1,2,2,4,4,4,8,10,10,10,16,12,16,28,16,20,24,24,18,28,32,8,40,32,24, %T A320196 34,32,32,34,56,20,40,42,40,64,56,32,32,72,28,72,64,32,60,72,84,36,88, %U A320196 56,66,98,40,80,40,80,104,68,44,40,92,52,116,80,42,72,100,96,84 %N A320196 Number of integer solutions to a^2 + 2*b^2 + 4*c^2 + 7*d^2 = n. %C A320196 a(n) > 0 for n >= 0. %H A320196 Seiichi Manyama, <a href="/A320196/b320196.txt">Table of n, a(n) for n = 0..10000</a> %F A320196 G.f.: theta_3(q) * theta_3(q^2) * theta_3(q^4) * theta_3(q^7). %Y A320196 Cf. A320193, A320194, A320195, A033720, A320197, A320198, A320199, A320200, A320201, A320202. %K A320196 nonn %O A320196 0,2 %A A320196 _Seiichi Manyama_, Oct 07 2018