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 A134236 #5 Apr 06 2020 00:21:40 %S A134236 210,210210,212010,212100,221010,221100,210210210,210212010,210212100, %T A134236 210221010,210221100,212010210,212012010,212012100,212021010, %U A134236 212021100,212100210,212102010,212102100,212120010,212120100,212121000,212201010 %N A134236 Ternary numbers with equal numbers of 0's, 1's and 2's and such that read left-to-right at all times the number of 2's >= number of 1's >= number of 0's. %C A134236 A005789(n) counts the terms here with 3n ternary digits. %Y A134236 Cf. A005789, A063171, A000108. %K A134236 base,nonn %O A134236 1,1 %A A134236 _Rick L. Shepherd_, Oct 14 2007