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 A144915 #2 Mar 30 2012 16:51:01 %S A144915 16,1111,526,156,1126,1103,185,312,11126,1734,1277,206,127,31,11,5,3, %T A144915 2,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, %U A144915 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1 %N A144915 Trajectory of 16 under iteration of the map k -> A087712(k). %C A144915 19 steps to see a repeat. %Y A144915 Cf. A087712, A098282. %K A144915 nonn %O A144915 0,1 %A A144915 _N. J. A. Sloane_, Feb 18 2009