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 A046648 #4 May 11 2007 03:00:00 %S A046648 1,2,7,30,143,728,3876,21318,120175,690690,4032015,23841480,142498692 %N A046648 Duplicate of A006013. %K A046648 dead %O A046648 0,2