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 A043717 #8 Jun 18 2021 23:07:58 %S A043717 1,2,3,4,5,6,7,8,9,10,11,12,13,15,30,45,60,75,90,105,120,135,150,165, %T A043717 180,195,197,198,199,200,201,202,203,204,205,206,207,208,209,211,224, %U A043717 225,227,228,229,230,231,232,233,234,235,236 %N A043717 Numbers whose base-14 representation has an odd number of runs. %K A043717 nonn,base %O A043717 1,2 %A A043717 _Clark Kimberling_