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 A203685 #7 Jan 14 2013 10:19:07
%S A203685 1,7,15652,4466072310336,257010442859540072735404130304,
%T A203685 12039114411811108434329752218564963041089979745446343475200
%N A203685 Vandermonde sequence using x^2 + xy + y^2 applied to (1,2,6,...,n!).
%C A203685 See A093883 for a discussion and guide to related sequences.
%t A203685 f[j_] := j!; z = 8;
%t A203685 u[n_] := Product[f[j]^2 + f[j] f[k] + f[k]^2,
%t A203685 {j, 1, k - 1}]
%t A203685 v[n_] := Product[u[n], {k, 2, n}]
%t A203685 Table[v[n], {n, 1, z}] (* A203685 *)
%t A203685 Table[v[n + 1]/v[n], {n, 1, z}] (* A203686 *)
%K A203685 nonn
%O A203685 1,2
%A A203685 _Clark Kimberling_, Jan 04 2012