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 A355904 #7 Sep 19 2022 06:58:56 %S A355904 0,1,2,210,211,212,21120,21121,21122,21100,21101,21102,2112010, %T A355904 2112011,2112012,2112220,2112221,2112222,2112200,2112201,2112202, %U A355904 2110110,2110111,2110112,211201020,211201021,211201022,211201000,211201001,211201002,211201210,211201211,211201212,211222120,211222121,211222122 %N A355904 Negasemiternary (or NST) representation of n. %D A355904 L. Rossi and J. Thuswaldner, A number system with base -3/2, American Mathematical Monthly, vol. 129, (June--July 2022), 539-553. %H A355904 Don Knuth, <a href="http://cs.stanford.edu/~knuth/papers/ambidextrous.pdf">Ambidextrous Numbers</a>, Preprint, September 2022. %Y A355904 Cf. A355905-A355913. %K A355904 nonn %O A355904 0,3 %A A355904 _N. J. A. Sloane_, Sep 18 2022