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 A095382 #3 Oct 15 2013 22:32:24 %S A095382 0,1,4,2,4,4,3,4,4,4,6,5,6,6,8,7,10,8,10,10,8,10,10,10,10,9,10,10,10, %T A095382 10,10,12,11,12,12,14,13,14,16,14,16,16,16,15,16,16,16,16,18,17,18,18, %U A095382 20,19,20,22,20,22,22,21,22,22,22 %N A095382 Exponents of power of 2 of the largest terms arising in the 3x+1 iterations started with terms of A095381. %F A095382 a[n]=Log[2, A025586[A095381(n)]] %Y A095382 Cf. A025586, A087256, A095381. %K A095382 nonn %O A095382 1,3 %A A095382 _Labos Elemer_, Jun 14 2004