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 A072659 #6 May 01 2014 02:43:29 %S A072659 0,1,2,3,4,6,7,5,14,9,16,8,42,15,17,11,37,12,19,121,43,51,28,44,20, %T A072659 126,39,21,10,40,385,123,149,124,52,54,23,112,30,53,376,127,154,84,56, %U A072659 18,163,38,1234,387,475,388,151,503,122,152,79,156,45,480,107,57,13,114 %N A072659 Inverse permutation to A072658. %H A072659 A. Karttunen, <a href="http://www.iki.fi/~kartturi/matikka/Nekomorphisms/gatomorf.htm">Gatomorphisms</a> (With the complete source) %H A072659 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A072659 A072659(n) = A057163(A072657(n)). A072660 gives the size of the corresponding parenthesizations, i.e. A072660(n) = A029837(A014486(A072659(n))+1)/2 [A029837(n+1) gives the binary width of n]. %K A072659 nonn %O A072659 0,3 %A A072659 _Antti Karttunen_, Jun 02 2002