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 A075903 #3 May 11 2007 03:00:00 %S A075903 0,1,4,5,6,9,10,24,25,32,40,49,50,51,56,60,75,76,90,99,100,125,240,249 %N A075903 Duplicate of A029942. %K A075903 dead %O A075903 1,3