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%I #9 Jul 05 2022 11:15:15
%S 1,2,3,4,5,7,6,8,11,9,12,16,10,13,17,22,14,18,23,29,15,19,24,30,37,20,
%T 25,31,38,46,21,26,32,39,47,56,27,33,40,48,57,67,28,34,41,49,58,68,79,
%U 35,42,50,59,69,80,92,36,43,51,60,70,81,93,106,44,52,61,71,82,94,107
%N Permutation of the natural numbers.
%C Write the natural numbers as a triangle:
%C 1
%C 2...3
%C 4...5...6
%C 7...8...9..10
%C 11..12..13..14..15
%C Now read off the numbers diagonally from upper-right to lower-left. 1 -> 2 -> 3 -> 4 -> 5 -> 7 -> 6 -> 8 -> 11 -> 9 -> 12 -> ...
%H Ivan Neretin, <a href="/A091995/b091995.txt">Table of n, a(n) for n = 1..10000</a>
%H <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%Y a(n) = A090894(n-1)+1. Cf. A092180.
%K easy,nonn
%O 1,2
%A _Felix Tubiana_, Mar 17 2004
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