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 A211431 #4 Apr 15 2012 21:22:56
%S A211431 1,7,13,19,27,37,47,57,67,77,87,97,107,117,131,145,159,173,187,201,
%T A211431 215,229,243,257,271,285,299,313,327,341,355,369,385,403,421,439,457,
%U A211431 475,493,511,529,547,565,583,601,619,637,655,673,691,709,727,745
%N A211431 Number of ordered triples (w,x,y) with all terms in {-n,...,0,...,n} and w^3+(x+y)^2=0.
%C A211431 For a guide to related sequences, see A211422.
%t A211431 t[n_] := t[n] = Flatten[Table[w^3 + (x + y)^2, {w, -n, n}, {x, -n, n}, {y, -n, n}]]
%t A211431 c[n_] := Count[t[n], 0]
%t A211431 t = Table[c[n], {n, 0, 80}] (* A211431 *)
%t A211431 (t - 1)/2 (* integers *)
%Y A211431 Cf. A211422.
%K A211431 nonn
%O A211431 0,2
%A A211431 _Clark Kimberling_, Apr 10 2012