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 A182112 #5 Apr 13 2012 11:21:52
%S A182112 1,4,7,10,13,16,20,24,28,32,36,40,45,50,55,60,65,70,75,80,86,92,98,
%T A182112 104,110,116,122,128,134,140,147,154,161,168,175,182,189,196,203,210,
%U A182112 217,224,232,240,248,256,264,272,280,288,296,304,312,320,328,336
%N A182112 Number of ordered triples (w,x,y) with all terms in {-n,...,0,...,n} and (w+n)^2=x+y+w.
%C A182112 For a guide to related sequences, see A211422.
%t A182112 t[n_] := t[n] = Flatten[Table[(n + w)^2 - x - y - w, {w, -n, n}, {x, -n, n}, {y, -n, n}]]
%t A182112 c[n_] := Count[t[n], 0]
%t A182112 t = Table[c[n], {n, 0, 70}] (* A182112 *)
%Y A182112 Cf. A211422.
%K A182112 nonn
%O A182112 0,2
%A A182112 _Clark Kimberling_, Apr 12 2012