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 A043692 #8 Jun 18 2021 22:35:41 %S A043692 3,5,6,7,9,12,14,17,18,22,24,25,27,30,32,33,34,36,39,41,44,46,47,48, %T A043692 50,53,54,57,59,60,61,64,65,67,69,70,72,76,78,79,81,84,86,87,88,90,93, %U A043692 95,98,99,103,105,106,108,111,113,114,115,117 %N A043692 Numbers whose base-3 representation has an even number of runs. %K A043692 nonn,base %O A043692 1,1 %A A043692 _Clark Kimberling_