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 A169693 #2 Mar 30 2012 16:51:44 %S A169693 1,2,3,4,5,7,8,11,12,13,18,20,21,29,32,33,34,47,52,54,55,76,84,87,88, %T A169693 89,123,136,141,143,144,199,220,228,231,232,233,322,356,369,374,376, %U A169693 377,521,576,597,605,608,609,610,843,932,966,979,984,986,987,1364,1508,1563,1584 %N A169693 A169690 union A169691. %K A169693 nonn %O A169693 1,2 %A A169693 _N. J. A. Sloane_, Apr 14 2010