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 A077200 #13 Dec 28 2020 02:50:43 %S A077200 0,1,2,5,2,4,4,23,16,4,2,6,4,1,6,65,2,2,4,8,1,4,6,16,24,7,98,16,2,12, %T A077200 6,211,1,1,3,64,4,1,7 %N A077200 Erroneous version of A085072. %K A077200 dead %O A077200 1,3