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 A212050 #5 Dec 04 2016 19:46:29
%S A212050 0,0,0,0,0,20,32,36,46,54,118,126,162,170,194,316,358,370,430,442,614,
%T A212050 666,714,730,840,1064,1124,1184,1276,1296,1686,1710,1824,1908,1980,
%U A212050 2320,2524,2552,2636,2732,3202,3234,3470,3502,3658,4222,4330
%N A212050 Number of (w,x,y,z) with all terms in {1,...,n} and 2w*x=5*y*z.
%C A212050 Each term is divisible by 2. See A211795 for a guide to related sequences.
%t A212050 t = Compile[{{n, _Integer}}, Module[{s = 0},
%t A212050 (Do[If[2 w*x == 5 y*z, s = s + 1],
%t A212050 {w, 1, #}, {x, 1, #}, {y, 1, #}, {z, 1, #}] &[n]; s)]];
%t A212050 Map[t[#] &, Range[0, 50]] (* A212050 *)
%t A212050 %/2 (* integers *)
%t A212050 (* _Peter J. C. Moses_, Apr 13 2012 *)
%Y A212050 Cf. A211795.
%K A212050 nonn
%O A212050 0,6
%A A212050 _Clark Kimberling_, Apr 29 2012