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 A034890 #3 May 11 2007 03:00:00 %S A034890 1,2,3,4,6,6,9,11,14,16,20,23,27,31,35,43,47,55,61,70,78,88,98,111,123 %N A034890 Duplicate of A009490. %K A034890 dead %O A034890 1,2