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 A203680 #7 Jan 14 2013 08:44:05
%S A203680 7,588,686784,11999490048,3246966011068416,13834880585785015271424,
%T A203680 935753249231126352597092401152,
%U A203680 1008697565620854720371433477717910093824,17363204603463390874081663579386879116150726197248
%N A203680 v(n+1)/v(n), where v=A203679.
%C A203680 See A093883 for a discussion and guide to related sequences.
%t A203680 f[j_] := 2^(j - 1); z = 12;
%t A203680 u[n_] := Product[f[j]^2 + f[j] f[k] + f[k]^2, {j, 1, k - 1}]
%t A203680 v[n_] := Product[u[n], {k, 2, n}]
%t A203680 Table[v[n], {n, 1, z}] (* A203679 *)
%t A203680 Table[v[n + 1]/v[n], {n, 1, z}] (* A203680 *)
%K A203680 nonn
%O A203680 1,1
%A A203680 _Clark Kimberling_, Jan 04 2012