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 A233740 #4 Dec 16 2013 09:53:41 %S A233740 2,2,5,6,5,8,7,5,13,11,9,13,21,19,18,20,15,32,28,26,23,21,20,20,21,28, %T A233740 24,38,34,37,31,42,36,35,36,30,28,32,39,35,35,63,57,62,57,54,49,43,50, %U A233740 43,39,38,33 %N A233740 a(n) = A233739(n)/2. %K A233740 nonn %O A233740 2,1 %A A233740 _Jonathan Sondow_, Dec 15 2013