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