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 A131612 #14 Feb 10 2014 01:29:10
%S A131612 1,2,3,15,121,3906,299593,67977560,39714002329,62556901638175,
%T A131612 257985813269495081,2806709131423433412540,80052769211806164721787281,
%U A131612 5990939163682951316587217125254,1174714712853607653027182667701045767,603476089599958368340121395090311986863711
%N A131612 (Fibonacci(n)^(n+1)-1)/(Fibonacci(n)-1).
%C A131612 Row sums of A131606 and A131609.
%t A131612 f[n_]:=Module[{fn=Fibonacci[n]},(fn^(n+1)-1)/(fn-1)]; Join[{1,2,3},f/@Range[3,20]] (* _Harvey P. Dale_, Mar 01 2011 *)
%K A131612 nonn
%O A131612 0,2
%A A131612 _Roger L. Bagula_ and _Gary W. Adamson_, May 27 2008
%E A131612 Edited by _N. J. A. Sloane_, May 28 2008