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 A043701 #8 Jun 18 2021 22:36:39 %S A043701 12,14,15,16,17,18,19,20,21,22,23,24,25,27,28,29,30,31,32,33,34,35,36, %T A043701 37,38,40,41,42,43,44,45,46,47,48,49,50,51,53,54,55,56,57,58,59,60,61, %U A043701 62,63,64,66,67,68,69,70,71,72,73,74,75,76 %N A043701 Numbers whose base-12 representation has an even number of runs. %K A043701 nonn,base %O A043701 1,1 %A A043701 _Clark Kimberling_