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 A240820 #16 Aug 29 2016 15:24:18 %S A240820 20,71,34,0,46,34,36,39,90,0,142,70,91,94,255,2004,306,525,259,454, %T A240820 304,1866,316,198,254,297,415,3315,348,406,397,420,903,1226,408,589, %U A240820 1294,535,490,958,1343,477,492,915,1378,1723,797,1869,745,696,863,1070,560 %N A240820 a(n) = length (or lifetime) of the meta-Fibonacci sequence f(k) = k for k <= n; f(k) = f(k-f(k-3)) + f(k-f(k-n)) if that sequence is only defined for finitely many terms, or 0 if that sequence is infinite. %C A240820 The term a(6) = 0 is only conjectural. %D A240820 D. R. Hofstadter, Curious patterns and non-patterns in a family of meta-Fibonacci recursions, Lecture in Doron Zeilberger's Experimental Mathematics Seminar, Rutgers University, April 10 2014. %H A240820 Lars Blomberg, <a href="/A240820/b240820.txt">Table of n, a(n) for n = 3..10000</a>, "infinity" = 10^8. %H A240820 D. R. Hofstadter, Curious patterns and non-patterns in a family of meta-Fibonacci recursions, Lecture in Doron Zeilberger's Experimental Mathematics Seminar, Rutgers University, April 10 2014; <a href="https://vimeo.com/91708646">Part 1</a>, <a href="https://vimeo.com/91710600">Part 2</a>. %H A240820 <a href="/index/Ho#Hofstadter">Index entries for Hofstadter-type sequences</a> %Y A240820 See A240827 for the sequence for n=6. %Y A240820 See A240823 for another version. %Y A240820 A diagonal of the triangle in A240821. %K A240820 nonn %O A240820 3,1 %A A240820 _N. J. A. Sloane_, Apr 15 2014 %E A240820 More terms from _Lars Blomberg_, Oct 24 2014