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 A266122 #6 Jan 02 2016 04:07:59 %S A266122 1,5,2,4,3,10,8,6,7,17,13,9,14,11,21,16,20,35,24,15,41,29,27,12,26,18, %T A266122 25,23,37,30,32,34,33,50,53,36,52,77,22,19,60,65,46,31,39,95,38,28,43, %U A266122 63,47,40,48,78,42,76,59,71,54,81,45,86,74,51,73,117,109,111,110,83,80,70,113,145,55,79,151,82,101,49 %N A266122 a(n) = index of n in A266121 or 0 if n is not present in that sequence. %C A266122 If A266121 is really a permutation of natural numbers, then this sequence is also, and no hypothetical zero-values are ever needed. %H A266122 Antti Karttunen, <a href="/A266122/b266122.txt">Table of n, a(n) for n = 1..8189</a> %H A266122 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %o A266122 (Scheme, with code for A266121 defined with defineperm1-macro also required) %o A266122 (define (A266122 n) (A266121 (- n))) ;; This returns inverse values of A266121 from its hidden cache. %Y A266122 Inverse: A266121 (with provisions, see comment section). %K A266122 nonn,base %O A266122 1,2 %A A266122 _Antti Karttunen_, Dec 23 2015