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 A060414 #10 Oct 20 2019 21:51:49 %S A060414 2,8,26,4616,125252,1242458,20581856,12324038948,282667562,282667562, %T A060414 3611141594,8904120362,45119577824,8077577336,795853127168, %U A060414 44621605808,1848429310544,3604523133626,483308017730 %N A060414 In the '3x+1' problem, take the sequence of starting values which set new records for the "dropping time" (A060412); sequence gives associated maximal value reached in the trajectory with that start. %H A060414 N. J. A. Sloane, <a href="/A060414/b060414.txt">Table of n, a(n) for n = 1..35</a> (from the web page of Tomás Oliveira e Silva) %H A060414 Tomás Oliveira e Silva, <a href="http://sweet.ua.pt/tos/3x+1.html">Tables</a> (gives many more terms) %H A060414 <a href="/index/3#3x1">Index entries for sequences related to 3x+1 (or Collatz) problem</a> %K A060414 nonn %O A060414 1,1 %A A060414 _N. J. A. Sloane_, Apr 06 2001; b-file added Nov 27 2007