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 A271369 #15 Feb 01 2025 23:18:47 %S A271369 2,3,0,1,1,8,6,6,9,9,0,7,0,4,0,2 %N A271369 Erroneous version of A248503. %K A271369 dead %O A271369 2,1