cp's OEIS Frontend

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.

A203697 Vandermonde sequence using x^2 + xy + y^2 applied to the Fibonacci numbers (1,2,3,5,...F(n+1)).

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%I A203697 #7 Jan 14 2013 08:30:59
%S A203697 1,7,1729,102427689,7859247487506324,5420939118751361437801775388,
%T A203697 212771631278201852610030565508935087592924796,
%U A203697 3245346956445033097411208139940145810977419605290236367412235927744
%N A203697 Vandermonde sequence using x^2 + xy + y^2 applied to the Fibonacci numbers (1,2,3,5,...F(n+1)).
%C A203697 See A093883 for a discussion and guide to related sequences.
%t A203697 f[j_] := Fibonacci[j + 1]; z = 11;
%t A203697 u[n_] := Product[f[j]^2 + f[j] f[k] + f[k]^2,
%t A203697   {j, 1, k - 1}]
%t A203697 v[n_] := Product[u[n], {k, 2, n}]
%t A203697 Table[v[n], {n, 1, z}]          (* A203697 *)
%t A203697 Table[v[n + 1]/v[n], {n, 1, z}] (* A203698 *)
%K A203697 nonn
%O A203697 1,2
%A A203697 _Clark Kimberling_, Jan 04 2012