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 A178169 #5 Mar 30 2012 17:22:56 %S A178169 1,2,8,64,1024,5120,32768,51200,153600,921600,1024000,2097152, %T A178169 11059200,40960000,44040192,265420800,268435456,532480000,1849688064, %U A178169 3276800000,12740198400,13844480000,68719476736,155373797376,524288000000 %N A178169 Numbers in A178168, sorted. %C A178169 At least the first 12332052 terms of this sequence are unique. It is conjectured that all terms are unique. The sequence is easy to compute by generating the Collatz tree on the fly while keeping track of products. %H A178169 T. D. Noe, <a href="/A178169/b178169.txt">Table of n, a(n) for n=1..1000</a> %K A178169 nonn %O A178169 1,2 %A A178169 _T. D. Noe_, May 21 2010