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 A072757 #3 Mar 30 2012 18:57:04 %S A072757 3,6,7,12,13,15,16,21,25,27,28,30,33,34,36,39,43,46,48,52,55,57,60,61, %T A072757 63,66,67,70,73,75,76,79,81,84,87,88,93,96,97,102,103,106,108,111,115, %U A072757 117,120,123,124,127,129,133,135,136,138,141,142,147,148,150,151,156 %N A072757 Complement of A072756. %Y A072757 Cf. A072756, A072758. %Y A072757 Seems to be A026344(n+1) + 1. %K A072757 nonn %O A072757 0,1 %A A072757 _Clark Kimberling_, Jul 09 2002