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 A033474 #6 May 11 2007 03:00:00 %S A033474 1,-1,7,-31,127,-2555,1414477,-57337,118518239,-5749691557,91546277357 %N A033474 Duplicate of A001896. %K A033474 dead %O A033474 0,3