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 A203682 #7 Jan 14 2013 04:02:16
%S A203682 3,156,142272,2194403328,557834881204224,2303742029718154641408,
%T A203682 153403122389516451861994930176,
%U A203682 164074442468721024925743366747249967104,2813282786110268238357922727341801514160674045952
%N A203682 v(n+1)/v(n), where v=A203681.
%C A203682 See A093883 for a discussion and guide to related sequences.
%t A203682 f[j_] := 2^(j - 1); z = 12;
%t A203682 u[n_] := Product[f[j]^2 - f[j] f[k] + f[k]^2,
%t A203682 {j, 1, k - 1}]
%t A203682 v[n_] := Product[u[n], {k, 2, n}]
%t A203682 Table[v[n], {n, 1, z}] (* A203681 *)
%t A203682 Table[v[n + 1]/v[n], {n, 1, z}] (* A203682 *)
%K A203682 nonn
%O A203682 1,1
%A A203682 _Clark Kimberling_, Jan 04 2012