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 A212049 #5 Dec 04 2016 19:46:29
%S A212049 0,0,0,0,0,18,26,30,38,44,108,116,144,152,172,280,314,326,372,384,564,
%T A212049 612,652,668,752,954,1002,1056,1136,1156,1528,1552,1642,1718,1778,
%U A212049 2084,2250,2278,2346,2430,2922,2954,3150,3182,3318,3830,3918,3954
%N A212049 Number of (w,x,y,z) with all terms in {1,...,n} and w*x=5*y*z.
%C A212049 Each term is divisible by 2. See A211795 for a guide to related sequences.
%t A212049 t = Compile[{{n, _Integer}}, Module[{s = 0},
%t A212049 (Do[If[w*x == 5 y*z, s = s + 1],
%t A212049 {w, 1, #}, {x, 1, #}, {y, 1, #}, {z, 1, #}] &[n]; s)]];
%t A212049 Map[t[#] &, Range[0, 50]] (* A212049 *)
%t A212049 %/2 (* integers *)
%t A212049 (* _Peter J. C. Moses_, Apr 13 2012 *)
%Y A212049 Cf. A211795.
%K A212049 nonn
%O A212049 0,6
%A A212049 _Clark Kimberling_, Apr 29 2012