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 A288922 #5 Jun 20 2017 23:53:15 %S A288922 1,3,141,5,129,11,9,7,68,13,131,19,133,17,46,15,135,29,137,21,27,72, %T A288922 139,31,44,74,50,25,143,36,145,23,48,76,34,33,147,78,52,38,149,37,151, %U A288922 56,24,80,153,35,54,40,70,64,155,39,84,42,86,82,157,26,159,161 %N A288922 Inverse permutation to A288921. %H A288922 Rémy Sigrist, <a href="/A288922/b288922.txt">Table of n, a(n) for n = 1..30000</a> %H A288922 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %e A288922 A288921(1) = 1, hence a(1) = 1. %e A288922 A288921(2) = 1260, hence a(1260) = 2. %e A288922 A288921(3) = 2, hence a(2) = 3. %e A288922 A288921(4) = 630, hence a(630) = 4. %e A288922 A288921(5) = 4, hence a(4) = 5. %e A288922 A288921(6) = 315, hence a(315) = 6. %e A288922 A288921(7) = 8, hence a(8) = 7. %e A288922 A288921(8) = 180, hence a(180) = 8. %e A288922 A288921(9) = 7, hence a(7) = 9. %e A288922 A288921(10) = 240, hence a(240) = 10. %Y A288922 Cf. A288921. %K A288922 nonn %O A288922 1,2 %A A288922 _Rémy Sigrist_, Jun 19 2017