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 A104463 #4 Mar 30 2012 18:57:06
%S A104463 0,1,3,6,7,12,13,15,16,21,25,27,28,30,33,34,36,39,43,46,48,52,55,57,
%T A104463 60,61,63,66,67,70,73,75,76,79,81,84,87,88,93,96,97,102,103,106,108,
%U A104463 111,115,117,120,123,124,127,129,133,135,136,138,141,142,147,148,150,151
%N A104463 Complement of {A072756(n): n>=2}.
%F A104463 A104463(n)=s(n)+Floor(s(n)/2), where s(n)=A072756(n).
%F A104463 a(n)=A072757(n-2), n>1. [From _R. J. Mathar_, Aug 28 2008]
%e A104463 The sequences a(n)=A072756(n) and b(n)=A104463(n) are jointly defined:
%e A104463 a(n) = least positive integer not a(k) + Floor(a(k)/2) for k<n. Thus
%e A104463 a(0)=0, b(0)=0, a(1)=1, b(1)=1, a(2)=2, b(2)=3, a(3)=4, b(4)=6,...
%Y A104463 Cf. A072756, A104464.
%K A104463 nonn
%O A104463 0,3
%A A104463 _Clark Kimberling_, Mar 08 2005