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 A203770 #7 Jan 14 2013 04:04:40
%S A203770 1,2,578,5345344,338179153563904,3466035612421233748051968,
%T A203770 1923520756594004458835713813690433667072,
%U A203770 546551001653798242379097661463711497556444294267384365056
%N A203770 Vandermonde sequence using x^4 + y^4 applied to (1,1,2,2,...,floor(n/2)).
%C A203770 See A093883 for a discussion and guide to related sequences.
%t A203770 f[j_] := Floor[(j + 1)/2]; z = 16;
%t A203770 u := Product[f[j]^4 + f[k]^4, {j, 1, k - 1}]
%t A203770 v[n_] := Product[u, {k, 2, n}]
%t A203770 Table[v[n], {n, 1, z}] (* A203770 *)
%t A203770 Table[v[n + 1]/v[n], {n, 1, z}] (* A203771 *)
%K A203770 nonn
%O A203770 1,2
%A A203770 _Clark Kimberling_, Jan 05 2012