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 A005678 M0134 #25 Dec 23 2024 11:33:00 %S A005678 1,2,1,3,2,1,2,3,1,2,1,3,2,3,1,3,2,1,2,3,1,2,1,3,2,1,2,3,1,3,2,3,1,2, %T A005678 1,3,2,1,2,3,1,2,1,3,2,3,1,3,2,1,2,3,1,3,2,3,1,2,1,3,2,3,1,3,2,1,2,3, %U A005678 1,2,1,3,2,1,2,3,1,3,2,3,1,2,1,3,2,1,2 %N A005678 A squarefree ternary sequence. %C A005678 Rules: 1 -> 1213, 2 -> 2123, 3 preceded by 1 -> 2313, 3 preceded by 2 -> 1323. - _Sean A. Irvine_, Nov 08 2020 %D A005678 G. Siebert, personal communication. %D A005678 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %D A005678 A. Thue. Über unendliche Zeichenreihen, Norske Vid. Selsk. Skr. I. Mat. Nat. Kl. Christiania, No. 7 (1906), 1-22. See p. 14. %H A005678 J. Berstel, <a href="http://www-igm.univ-mlv.fr/~berstel/Articles/1994ThueTranslation.pdf">Axel Thue's papers on repetitions in words: a translation</a>, 1994. %H A005678 David M. Cerna, <a href="https://arxiv.org/abs/2412.10307">A Note On Square-free Sequences and Anti-unification Type</a>, arXiv:2412.10307 [cs.LO], 2024. See p. 4. %H A005678 G. Siebert, <a href="/A001285/a001285_1.pdf">Letter to N. J. A. Sloane, Sept. 1977</a> %K A005678 nonn %O A005678 1,2 %A A005678 _N. J. A. Sloane_ %E A005678 More terms from _Sean A. Irvine_, Nov 08 2020