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 A287929 #13 Jun 04 2017 16:37:30 %S A287929 1,2,3,4,5,6,7,8,9,10,12,11,13,15,14,16,18,17,19,20,22,24,21,23,25,27, %T A287929 29,26,28,30,32,31,34,36,33,35,38,37,39,40,42,45,44,43,41,46,47,48,49, %U A287929 50,52,55,53,51,57,59,54,56,58,60,62,64,66,67,61,63,65 %N A287929 Inverse permutation to A287928. %H A287929 Rémy Sigrist, <a href="/A287929/b287929.txt">Table of n, a(n) for n = 1..10000</a> %H A287929 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %e A287929 A287928(11) = 12, hence a(12) = 11. %e A287929 A287928(12) = 11, hence a(11) = 12. %e A287929 A287928(14) = 15, hence a(15) = 14. %e A287929 A287928(15) = 14, hence a(14) = 15. %e A287929 A287928(17) = 18, hence a(18) = 17. %e A287929 A287928(18) = 17, hence a(17) = 18. %e A287929 A287928(21) = 23, hence a(23) = 21. %e A287929 A287928(22) = 21, hence a(21) = 22. %e A287929 A287928(23) = 24, hence a(24) = 23. %e A287929 A287928(24) = 22, hence a(22) = 24. %Y A287929 Cf. A287928. %K A287929 nonn,base %O A287929 1,2 %A A287929 _Rémy Sigrist_, Jun 03 2017