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 A212021 #7 Dec 04 2016 19:46:28
%S A212021 0,0,0,8,16,20,48,56,80,132,164,176,272,288,332,436,512,532,696,720,
%T A212021 844,1000,1076,1104,1360,1430,1518,1758,1942,1978,2328,2368,2566,2818,
%U A212021 2938,3098,3600,3648,3780,4084,4440,4492,4996,5052,5348,5920
%N A212021 Number of (w,x,y,z) with all terms in {1,...,n} and 2w*x=3*y*z.
%C A212021 Each term is divisible by 2. See A211795 for a guide to related sequences.
%t A212021 t = Compile[{{n, _Integer}}, Module[{s = 0},
%t A212021 (Do[If[2 w*x == 3 y*z, s = s + 1],
%t A212021 {w, 1, #}, {x, 1, #}, {y, 1, #}, {z, 1, #}] &[n]; s)]];
%t A212021 Map[t[#] &, Range[0, 50]] (* A212021 *)
%t A212021 %/2 (* integers *)
%t A212021 (* _Peter J. C. Moses_, Apr 13 2012 *)
%Y A212021 Cf. A211795.
%K A212021 nonn
%O A212021 0,4
%A A212021 _Clark Kimberling_, Apr 28 2012