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 A277796 #19 Jan 13 2025 06:35:24 %S A277796 1,1,1,1,2,3,6,11,23,47,105,231,537 %N A277796 Erroneous version of A130131. %K A277796 dead %O A277796 0,5