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 A236931 #17 May 31 2022 14:55:05 %S A236931 1,6,12,8,6,24,26,12,36,46,36,72,56,24,72,60,54,96,52,72,120,48,36,96, %T A236931 98,90,144,144,60,120,144,60,180,172,96,240,142,72,192,96,132,288,180, %U A236931 120,216,168,144,192,152,162,276,256,120,216,210,120,264,256,180,360,300 %N A236931 Number of integer solutions to a^2 + b^2 + c^2 + 6*d^2 = n. %H A236931 Seiichi Manyama, <a href="/A236931/b236931.txt">Table of n, a(n) for n = 0..10000</a> %F A236931 G.f.: theta_3(q)^3*theta_3(q^6), where theta_3() is the Jacobi theta function. - _Ilya Gutkovskiy_, Aug 01 2018 %p A236931 See A236924. %Y A236931 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 A236931 nonn %O A236931 0,2 %A A236931 _N. J. A. Sloane_, Feb 16 2014