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 A077201 #16 May 30 2020 15:12:39 %S A077201 1,3,5,49,11,22,17,16983563041,529,38,31 %N A077201 Erroneous version of A120426. %K A077201 dead %O A077201 0,2