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 A049204 #6 May 11 2007 03:00:00 %S A049204 1,2,3,4,10,70,72,182,440,1053,6458,6461,6471,40087,40089,251737 %N A049204 Duplicate of A045924. %K A049204 dead %O A049204 1,2