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 A144813 #6 Feb 11 2018 16:36:00 %S A144813 8,111,212,1116,112211,52626,124441,28192,11111152,111165448, %T A144813 1117261018,1910112963,252163429,42205629,2914219,454002,127605, %U A144813 231542,110938,15631,44510,13605,23155,3582,12246,12637,1509,296 %N A144813 Trajectory of 8 under iteration of the map k -> A087712(k). %C A144813 55 steps to see a repeat. %H A144813 Andrew Howroyd, <a href="/A144813/b144813.txt">Table of n, a(n) for n = 0..55</a> %Y A144813 Cf. A087712, A098282. %K A144813 nonn,base %O A144813 0,1 %A A144813 _N. J. A. Sloane_, Feb 18 2009