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 A104464 #8 Apr 17 2023 06:18:54 %S A104464 1,2,3,4,6,5,7,8,12,9,13,10,15,11,16,14,21,17,25,18,27,19,28,20,30,22, %T A104464 33,23,34,24,36,26,39,29,43,31,46,32,48,35,52,37,55,38,57,40,60,41,61, %U A104464 42,63,44,66,45,67,47,70,49,73,50,75,51,76,53,79,54,81,56,84,58,87,59 %N A104464 Permutation of natural numbers based on A072756 and A104463. %C A104464 Apparently a(n) = A072758(n). - _R. J. Mathar_, Jul 09 2011 %F A104464 Let b(n)=A072756(n) and c(n)=A104463(n). Then this sequence is given by c(1), b(2), c(2), b(3), c(3), b(4), c(4), ... %Y A104464 Cf. A072756, A072758, A104463. %K A104464 nonn %O A104464 1,2 %A A104464 _Clark Kimberling_, Mar 08 2005