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 A203753 #7 Jan 14 2013 04:49:43
%S A203753 1,1,36,144,21609,194481,65804544,1052872704,633623960025,
%T A203753 15840599000625,14897346862777344,536304487059984384,
%U A203753 726332080998489123249,35590271968925967039201,65608418035212856848285696
%N A203753 v(n+1)/v(n), where v=A203752.
%C A203753 See A093883 for a discussion and guide to related sequences.
%t A203753 f[j_] := Floor[j/2]; z = 20;
%t A203753 u := Product[f[j]^2 - f[j] f[k] + f[k]^2, {j, 1, k - 1}]
%t A203753 v[n_] := Product[u, {k, 2, n}]
%t A203753 Table[v[n], {n, 1, z}] (* A203752 *)
%t A203753 Table[v[n + 1]/v[n], {n, 1, z}] (* A203753 *)
%t A203753 Table[Sqrt[v[n + 1]/v[n]], {n, 1, z}] (* A203754 *)
%K A203753 nonn
%O A203753 1,3
%A A203753 _Clark Kimberling_, Jan 05 2012