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 A000547 #7 Jun 20 2012 14:22:23 %S A000547 0,9,18,37,25,120,36,47,42,59,137,143,51,48,141,41,57,73,77,76,166,80, %T A000547 104,93,78,96,181,102,91,102,209,201,197,194,196,129,230,115,200,97, %U A000547 213,206,115,216,220,214,208,246,211,233,199,208,209,224,207,228 %N A000547 Number of steps to reach 1 in sequence A000546. %H A000547 T. D. Noe, <a href="/A000547/b000547.txt">Table of n, a(n) for n = 1..100</a> %Y A000547 Cf. A000546. %K A000547 nonn %O A000547 1,2 %A A000547 Peter L. Stone [ PetStone(AT)aol.com ]