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 A105564 #7 Feb 25 2018 22:55:15
%S A105564 0,0,0,1,1,1,1,2,2,2,2,2,3,3,3,3,3,4,4,4,4,5,5,5,5,5,6,6,6,6,6,7,7,7,
%T A105564 7,8,8,8,8,8,9,9,9,9,10,10,10,10,10,11,11,11,11,11,12,12,12,12,13,13,
%U A105564 13,13,13,14,14,14,14,14,15,15,15,15,16,16,16,16,16,17,17,17,17,17,18,18
%N A105564 Number of blocks of exactly 4 Fibonacci numbers having equal length <= n.
%C A105564 Lim_{n->infinity} a(n)/n = 5 - 1/log_10((1+sqrt(5))/2) = 0.215....
%C A105564 a(n) = Sum_{k=1..n} A105563(k); a(n) = n - A105566(n).
%D A105564 Juergen Spilker, Die Ziffern der Fibonacci-Zahlen, Elemente der Mathematik 58 (Birkhäuser 2003).
%K A105564 nonn
%O A105564 1,8
%A A105564 _Reinhard Zumkeller_, Apr 14 2005