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 A008715 #8 Jul 08 2025 01:20:40 %S A008715 10,11,12,13,14,15,16,17,18,20,22,24,30,33,102,200,10010, %T A008715 111111111111111111 %N A008715 18 in base 18-n. %K A008715 fini,nonn,base,full %O A008715 0,1 %A A008715 _N. J. A. Sloane_