%I #4 Jul 20 2017 22:51:26
%S 1,3,2,6,8,4,5,12,14,7,17,18,9,21,10,11,26,27,13,30,32,15,35,16,38,39,
%T 41,19,44,20,47,48,22,23,53,24,25,57,59,60,62,28,29,66,68,31,71,72,33,
%U 75,34,78,80,36,37,84,86,87,89,40,92,93,42,43,98,99,45,102,46,105,107
%N Inverse of A120231.
%C A permutation of the natural numbers.
%e A120231, written as a function, is
%e {(1,1),(2,3),(3,2),(4,6),(5,7),(6,4),(7,10),(8,5)...}.
%e Reversing each ordered pair and reordering gives
%e {(1,1),(2,3),(3,2),(4,6),(5,8),(6,4),(7,5),(8,12)...}.
%e Suppressing first components leaves
%e 1,3,2,6,8,4,5,12,...
%Y Cf. A073675, A120230, A120231.
%K nonn
%O 1,2
%A _Clark Kimberling_, Jun 11 2006