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 A074146 #2 Dec 06 2006 03:00:00 %S A074146 1,2,4,3,5,7,6,8,9,13,10,11,12,14,23,15,16,17,18,19,29,20,21,22,24 %N A074146 Erroneous version of A074135. %K A074146 dead %O A074146 1,2