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 A236926 #19 Nov 11 2018 06:17:48 %S A236926 1,6,12,10,18,48,40,12,60,78,24,48,70,84,120,32,66,192,84,36,144,180, %T A236926 120,96,136,126,168,82,84,336,200,60,252,288,96,96,234,228,360,140, %U A236926 120,480,144,84,336,336,240,192,310,258,252,128,252,624,400,96,408,540,168 %N A236926 Number of integer solutions to a^2 + b^2 + c^2 + 3*d^2 = n. %H A236926 Seiichi Manyama, <a href="/A236926/b236926.txt">Table of n, a(n) for n = 0..10000</a> %H A236926 J. Liouville, <a href="http://sites.mathdoc.fr/JMPA/PDF/JMPA_1863_2_8_A9_0.pdf">Sur La Forme x^2+y^2+z^2+3t^2</a>, Journal de Mathématiques Pures et appliquées (2) 8, 193-204 (1863). %F A236926 G.f.: theta_3(q)^3*theta_3(q^3), where theta_3() is the Jacobi theta function. - _Ilya Gutkovskiy_, Aug 01 2018 %p A236926 See A236924. %Y A236926 Cf. A236924. %Y A236926 For number of solutions to a^2+b^2+c^2+k*d^2=n for k=1,2,3,4,5,6,7,8,12 see A000118, A236928, A236926, A236923, A236930, A236931, A236932, A236927, A236933. %K A236926 nonn %O A236926 0,2 %A A236926 _N. J. A. Sloane_, Feb 15 2014