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 A355912 #5 Sep 19 2022 07:35:17 %S A355912 1,2,1,1,2,2,0,0,1,1,2,1,2,1,2,0,1,0,0,2,0,2,0,1,2,1,2,2,0,0,2,0,2,0, %T A355912 0,0,1,2,2,1,2,0,1,2,0,0,0,2,0,2,0,2,2,0,2,2,2,2,1,0,1,2,2,2,0,0,2,1, %U A355912 0,1,1,1,1,0,1,1 %N A355912 Negasemiternary (or NST) representation of the unit ambinumber (0,1). %H A355912 Don Knuth, <a href="http://cs.stanford.edu/~knuth/papers/ambidextrous.pdf">Ambidextrous Numbers</a>, Preprint, September 2022. See (15.2). %e A355912 (0, 1) = 1.21122 00112 12120 10020 20121 22002 ... %Y A355912 Cf. A355904-A355911, A355913. %K A355912 nonn %O A355912 1,2 %A A355912 _N. J. A. Sloane_, Sep 19 2022