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 A091798 #3 Dec 09 2007 03:00:00 %S A091798 0,1,5,11,59,59,419,839,2519,2519,27719,27719,360359,360359,360359 %N A091798 Duplicate of A070198. %K A091798 dead %O A091798 1,3