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 A072647 #9 Jul 31 2017 03:31:55 %S A072647 0,1,2,6,3,15,4,5,52,7,16,19,14,466,11,9,37,8,112,42,43,5095,20,53,44, %T A072647 39,127,10,28,481,123,121,149,51,17231,29,12,40,17,41,154,155,153,18, %U A072647 47,156,38,1512,477,475,385,151,1234,122,376,69829,55,159,56,113,164 %N A072647 a(n) = A072637(A048679(n)). %C A072647 Composition of the permutations A072637 & A048679. %H A072647 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms</a> %H A072647 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A072647 A072645 gives the size of the corresponding parenthesizations, i.e., A072645(n) = A029837(A014486(A072647(n)) + 1)/2. (A029837(n+1) gives the binary width of n.) %K A072647 nonn %O A072647 0,3 %A A072647 _Antti Karttunen_, Jun 02 2002