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 A211432 #4 Apr 16 2012 16:21:00
%S A211432 1,9,17,25,33,57,65,73,81,89,113,121,129,153,161,185,193,217,225,233,
%T A211432 257,265,273,281,289,329,353,361,369,393,417,425,433,441,465,489,497,
%U A211432 521,529,553,577,601,609,617,625,649,657,665,673,681,721,745
%N A211432 Number of ordered triples (w,x,y) with all terms in {-n,...,0,...,n} and w^2=x^2+y^2.
%C A211432 For a guide to related sequences, see A211422.
%t A211432 t[n_] := t[n] = Flatten[Table[-w^2 + x^2 + y^2, {w, -n, n}, {x, -n, n}, {y, -n, n}]]
%t A211432 c[n_] := Count[t[n], 0]
%t A211432 t = Table[c[n], {n, 0, 70}] (* A211432 *)
%t A211432 (t - 1)/8 (* integers *)
%Y A211432 Cf. A211422.
%K A211432 nonn
%O A211432 0,2
%A A211432 _Clark Kimberling_, Apr 10 2012