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 A240812 #20 Oct 25 2014 01:27:30 %S A240812 13,10,11,13,44,31,49,38,80,58,69,61,57,60,63,78,81,85,81,84,87,96,99, %T A240812 109,105,108,111,120,123,126,129,132,135,138,141,144,153,156,159,162, %U A240812 165,168,177,180,183,186,189,192,201,204,207,210,213,216,225,228,231 %N A240812 a(n) = length (or lifetime) of the meta-Fibonacci sequence f(1) = ... = f(n) = 1; 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. %D A240812 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 A240812 Lars Blomberg, <a href="/A240812/b240812.txt">Table of n, a(n) for n = 3..10000</a>, "infinity" = 10^8. %H A240812 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 A240812 <a href="/index/Ho#Hofstadter">Index entries for Hofstadter-type sequences</a> %Y A240812 See A240815 for another version. %Y A240812 A diagonal of the triangle in A240813. %K A240812 nonn %O A240812 3,1 %A A240812 _N. J. A. Sloane_, Apr 15 2014 %E A240812 More terms from _Lars Blomberg_, Oct 24 2014