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 A023737 #10 Jun 27 2011 21:36:33 %S A023737 0,1,2,3,5,6,7,8,10,11,12,13,15,16,17,18,25,26,27,28,30,31,32,33,35, %T A023737 36,37,38,40,41,42,43,50,51,52,53,55,56,57,58,60,61,62,63,65,66,67,68, %U A023737 75,76,77,78,80,81,82,83,85,86,87,88,90,91,92 %N A023737 Duplicate of A020654. %K A023737 dead %O A023737 1,3