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 A291795 #13 Mar 24 2019 14:38:22 %S A291795 6,16,16,22,56,34,176,76,62,208,62,208,68,768,104,88,106,224,146,134, %T A291795 226,172,132,4432,206,232,378,206,432,380,208,290,1336,224,280,1152, %U A291795 336,210,1190,356,386,292,254,806,324,362,278,316,610,1968,710,628,10434 %N A291795 Consider Post's tag system applied to the word (100)^n; a(n) = length of the longest word in the orbit, or -1 if the orbit is unbounded. %H A291795 Lars Blomberg, <a href="/A291795/b291795.txt">Table of n, a(n) for n = 1..6075</a> %H A291795 Peter R. J. Asveld, <a href="http://doc.utwente.nl/66184/1/1988m20.pdf">On a Post's System of Tag</a>. Bulletin of the EATCS 36 (1988), 96-102. %Y A291795 Cf. A284116 and the cross-references there. %K A291795 nonn %O A291795 1,1 %A A291795 _N. J. A. Sloane_, Sep 04 2017 %E A291795 a(33) and beyond from _Lars Blomberg_, Apr 19 2018