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 A328073 #6 Oct 07 2019 09:06:00
%S A328073 1,2,21,211,212,2111,2112,2122,21111,21112,21121,21122,21221,21222,
%T A328073 211111,211112,211121,211122,211221,211222,212211,212221,212222,
%U A328073 2111111,2111112,2111121,2111122,2111211,2111221,2111222,2112121,2112211,2112221,2112222,2122111,2122112,2122121,2122211,2122212,2122221,2122222
%N A328073 List of Nyldon words over {1,2}.
%H A328073 Émilie Charlier, Manon Philibert, Manon Stipulanti, <a href="https://arxiv.org/abs/1804.09735">Nyldon words</a>, arXiv:1804.09735 [math.CO], 2018. Also J. Comb. Thy. A, 167 (2019), 60-90. See Table 1.
%Y A328073 Cf. A001037, A102659, A328072.
%K A328073 nonn
%O A328073 1,2
%A A328073 _N. J. A. Sloane_, Oct 07 2019