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 A261098 #12 Sep 24 2015 01:40:24 %S A261098 1,0,4,5,2,3,7,6,10,11,8,9,18,19,20,21,22,23,12,13,14,15,16,17,25,24, %T A261098 28,29,26,27,31,30,34,35,32,33,42,43,44,45,46,47,36,37,38,39,40,41,49, %U A261098 48,52,53,50,51,55,54,58,59,56,57,66,67,68,69,70,71,60,61,62,63,64,65,96,97,98,99,100,101 %N A261098 Row 1 of A261096. %C A261098 Equally, column 1 of A261097. %C A261098 Take the n-th (n>=0) permutation from the list A055089 (A195663), change 1 to 2 and 2 to 1 to get another permutation, and note its rank in the same list to obtain a(n). %C A261098 Self-inverse permutation of nonnegative integers. %H A261098 Antti Karttunen, <a href="/A261098/b261098.txt">Table of n, a(n) for n = 0..5039</a> %H A261098 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A261098 a(n) = A261096(1,n). %F A261098 By conjugating related permutations: %F A261098 a(n) = A060119(A261218(A060126(n))). %e A261098 In A195663 the permutation with rank 12 is [1,3,4,2], and swapping the elements 1 and 2 we get permutation [2,3,4,1], which is listed in A195663 as the permutation with rank 18, thus a(12) = 18. %Y A261098 Row 1 of A261096, column 1 of A261097. %Y A261098 Cf. A055089, A195663. %Y A261098 Cf. also A004442. %Y A261098 Related permutations: A060119, A060126, A261218. %K A261098 nonn %O A261098 0,3 %A A261098 _Antti Karttunen_, Aug 26 2015