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 A212052 #5 Dec 04 2016 19:46:29
%S A212052 0,0,0,0,0,18,26,30,46,52,104,112,148,156,176,278,342,354,406,418,562,
%T A212052 602,642,658,794,988,1040,1090,1190,1210,1526,1550,1726,1794,1858,
%U A212052 2152,2368,2396,2468,2548,2980,3012,3212,3244,3408,3890,3982,4018
%N A212052 Number of (w,x,y,z) with all terms in {1,...,n} and 4w*x=5*y*z.
%C A212052 See A211795 for a guide to related sequences.
%t A212052 t = Compile[{{n, _Integer}}, Module[{s = 0},
%t A212052 (Do[If[4 w*x == 5 y*z, s = s + 1],
%t A212052 {w, 1, #}, {x, 1, #}, {y, 1, #}, {z, 1, #}] &[n]; s)]];
%t A212052 Map[t[#] &, Range[0, 50]] (* A212052 *)
%t A212052 %/2 (* integers *)
%t A212052 (* _Peter J. C. Moses_, Apr 13 2012 *)
%Y A212052 Cf. A211795.
%K A212052 nonn
%O A212052 0,6
%A A212052 _Clark Kimberling_, Apr 29 2012