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 A072645 #2 May 01 2014 02:43:29 %S A072645 0,1,2,3,2,4,3,3,5,3,4,4,4,7,4,4,5,3,6,5,5,9,4,5,5,5,6,4,5,7,6,6,6,5, %T A072645 10,5,4,5,4,5,6,6,6,4,5,6,5,8,7,7,7,6,8,6,7,11,5,6,5,6,6,5,4,6,7,6,6, %U A072645 6,8,5,6,7,5,7,6,6,10,8,7,7,7,7,7,8,8,7,7,8,6,12,6,5,6,4,7,7,7,8,5,6,5,6 %N A072645 Size of the parenthesizations obtained with the global ranking/unranking scheme A072646/A072647. %Y A072645 Each value v occurs A000108(v) times. The maximum position for value v to occur is A072654(v). Permutations: A071673, A072643, A072644, A072660. %K A072645 nonn %O A072645 0,3 %A A072645 _Antti Karttunen_, Jun 02 2002