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 A151729 #2 Mar 30 2012 16:51:06 %S A151729 0,2,2,5,3,7,9,11,3,7,10,14,14,24,29,23,3,7,10,14,14,24,30,26,14,25, %T A151729 35,43,53,78,81,47,3,7,10,14,14,24,30,26,14,25,35,43,53,78,82,50,14, %U A151729 25,35,43,53,79,87,67,54,86,114,140,185,238,209,95 %N A151729 a(n) = (A151728(n)-1)/2. %Y A151729 Cf. A151725-A151728. %K A151729 nonn %O A151729 0,2 %A A151729 _N. J. A. Sloane_, Jun 14 2009