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 A008710 #8 Jul 08 2025 01:20:18 %S A008710 10,11,12,13,14,15,16,21,23,31,111,1101,1111111111111 %N A008710 13 in base 13-n. %K A008710 fini,nonn,base,full %O A008710 0,1 %A A008710 _N. J. A. Sloane_