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