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 A008717 #8 Jul 08 2025 01:20:50 %S A008717 10,11,12,13,14,15,16,17,18,19,20,22,24,26,32,40,110,202,10100, %T A008717 11111111111111111111 %N A008717 20 in base 20-n. %K A008717 fini,nonn,base,full %O A008717 0,1 %A A008717 _N. J. A. Sloane_