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 A074280 #4 May 11 2007 03:00:00 %S A074280 0,1,1,2,2,2,2,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,4,5,5,5, %T A074280 5,5 %N A074280 Duplicate of A000523. %K A074280 dead %O A074280 1,4