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 A187912 #4 Mar 30 2012 18:57:21 %S A187912 2,6,9,12,16,18,23,25,30,32,35,39,43,46,48,51,55,60,62,65,67,72,76,79, %T A187912 83,85,88,92,95,97,102,104,109,113,115,120,122,125,129,132,134,137, %U A187912 141,145,148,152,157,159,162,164,169,171,174,178,181,185,188,190,194,199,201,206,208,211,215,218 %N A187912 Complement of A187911. %C A187912 See A187224. %t A187912 (See A187911.) %Y A187912 Cf. A187224, A187911. %K A187912 nonn %O A187912 1,1 %A A187912 _Clark Kimberling_, Mar 15 2011