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 A081273 #3 May 11 2007 03:00:00 %S A081273 1,10,28,55,91,136,190,253,325,406,496,595,703,820,946,1081,1225,1378 %N A081273 Duplicate of A060544. %K A081273 dead %O A081273 1,2