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 A083270 #5 May 11 2007 03:00:00 %S A083270 2,4,9,15,30,39,61,72,99,146,162,219,263,283,329,409,487,519,609,675 %N A083270 Duplicate of A000879. %K A083270 dead %O A083270 1,1