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 A070874 #3 Mar 30 2012 16:49:24 %S A070874 3,4,7,8,11,12,14,15,16,23,24,27,28,29,30,31,32,33,39,40,47,48,55,56, %T A070874 59,60,61,62,63,64,65,67,71,72,79,80,88,95,96,103,104,111,112,119,120, %U A070874 121,123,124,125,126,127,128,129,130,131,132,135,136 %N A070874 A070871(n) < n. %K A070874 nonn %O A070874 1,1 %A A070874 _N. J. A. Sloane_, May 19 2002