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 A266118 #9 Jan 02 2016 04:06:15 %S A266118 1,2,3,4,5,8,9,11,12,6,7,10,14,18,23,22,19,15,16,26,21,20,27,13,31,17, %T A266118 37,30,28,25,59,24,39,33,70,40,41,48,47,38,35,29,74,44,64,54,53,32,45, %U A266118 56,49,50,34,36,51,61,62,55,52,57,42,58,66,63,43,60,75,69,68,76,77,46,73,67,85,83,94,78,71,65,89,98,136,79,119,100 %N A266118 a(n) = index of n in A266117 or 0 if n is not present in that sequence. %C A266118 It is conjectured that A266117 is not just injective, but also surjective on N, i.e., that it is a true permutation of natural numbers. In that case also this sequence is a true permutation, and no hypothetical zero-values are ever needed. %H A266118 Antti Karttunen, <a href="/A266118/b266118.txt">Table of n, a(n) for n = 1..12634</a> %H A266118 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A266118 (Scheme, with code for A266117 defined with defineperm1-macro also required) %o A266118 (define (A266118 n) (A266117 (- n))) ;; This returns inverse values of A266117 from its hidden cache. %Y A266118 Inverse: A266117 (with provisions, see comment section). %K A266118 nonn,base %O A266118 1,2 %A A266118 _Antti Karttunen_, Dec 22 2015