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 A080753 #5 Mar 30 2012 17:27:18 %S A080753 2,5,8,12,15,18,22,25,28,32,36,39,42,46,49,52,56,59,62,66,70,73,76,80, %T A080753 83,86,90,93,96,100,104,107,110,114,118,121,124,128,131,134,138,141, %U A080753 144,148,152,155,158,162,165,168,172,175,178,182,186,189,192,196,199,202 %N A080753 a(1)=2; for n > 1, a is the second-smallest positive integer greater than a(n-1) such that the condition "n is in the sequence if and only if a(n) is odd" is satisfied. %H A080753 B. Cloitre, N. J. A. Sloane and M. J. Vandermast, <a href="http://www.cs.uwaterloo.ca/journals/JIS/index.html">Numerical analogues of Aronson's sequence</a>, J. Integer Seqs., Vol. 6 (2003), #03.2.2. %H A080753 B. Cloitre, N. J. A. Sloane and M. J. Vandermast, <a href="http://arXiv.org/abs/math.NT/0305308">Numerical analogues of Aronson's sequence</a> (math.NT/0305308) %Y A080753 Cf. A079000. %K A080753 easy,nonn %O A080753 1,1 %A A080753 _Matthew Vandermast_, Mar 08 2003