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 A211812 #7 Dec 04 2016 19:46:28
%S A211812 0,1,15,75,224,525,1077,1960,3299,5249,7939,11534,16285,22313,29890,
%T A211812 39289,50713,64431,80854,100157,122747,148980,179165,213687,253113,
%U A211812 297646,347806,404160,467027,536878,614464,700012,794247,897729
%N A211812 Number of 4-tuples (w,x,y,z) with all terms in {1,...,n} and w*x<=3*y*z.
%C A211812 a(n)+A211918(n)=n^4.
%C A211812 See A211795 for a guide to related sequences.
%t A211812 t = Compile[{{n, _Integer}}, Module[{s = 0},
%t A211812 (Do[If[w*x <= 3 y*z, s = s + 1],
%t A211812 {w, 1, #}, {x, 1, #}, {y, 1, #}, {z, 1, #}] &[n]; s)]];
%t A211812 Map[t[#] &, Range[0, 40]] (* A211812 *)
%t A211812 (* _Peter J. C. Moses_, Apr 13 2012 *)
%Y A211812 Cf. A211795.
%K A211812 nonn
%O A211812 0,3
%A A211812 _Clark Kimberling_, Apr 27 2012