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 A001736 #7 Feb 03 2022 22:50:11 %S A001736 4,4,4,4,4,4,10,11,100,1111 %N A001736 4 in base 10-n. %K A001736 fini,nonn,base,full %O A001736 0,1 %A A001736 _N. J. A. Sloane_