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 A123054 #11 Apr 15 2013 10:37:28 %S A123054 1,2,3,4,5,6,9,10,11,19,20,30,40,49,50,51,60,90,100,110,190,200,300, %T A123054 400,500,600,900,1000,1100,1900,2000,3000 %N A123054 Erroneous version of A093703. %K A123054 dead %O A123054 1,2