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 A072661 #5 Jul 30 2017 21:42:06 %S A072661 0,1,0,2,1,0,3,2,4,1,0,2,3,0,5,4,6,1,4,3,2,8,1,0,2,5,0,7,6,4,5,4,6,3, %T A072661 0,9,8,10,1,8,3,2,12,1,0,2,7,8,5,4,6,5,4,7,6,16,1,0,2,9,0,11,10,4,9,8, %U A072661 10,3,0,13,12,14,1,12,3,2,8,9,8,10,5,8,7,6,12,5,4,6,7,0,17,16,18,1,16,3,2 %N A072661 Composition of the A059905 and A048679, i.e., a(n) = A059905(A048679(n)). %Y A072661 The other side of this projection is A072662. Used to construct the permutations A072657 and A072659. %K A072661 nonn %O A072661 0,4 %A A072661 _Antti Karttunen_, Jun 02 2002