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 A085481 #3 May 11 2007 03:00:00 %S A085481 1,3,12,45,171,648,2457,9315,35316,133893,507627,1924560,7296561 %N A085481 Duplicate of A030195. %K A085481 dead %O A085481 1,2