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 A338253 #8 Oct 20 2020 19:04:07 %S A338253 0,1,2,3,5,4,9,8,6,7,10,11,13,12,18,19,21,20,17,16,14,15,34,35,37,36, %T A338253 33,32,30,31,25,24,22,23,26,27,29,28,41,40,38,39,42,43,45,44,50,51,53, %U A338253 52,49,48,46,47,73,72,70,71,74,75,77,76,82,83,85,84,81,80 %N A338253 Inverse permutation to A338251. %H A338253 Rémy Sigrist, <a href="/A338253/b338253.txt">Table of n, a(n) for n = 0..5461</a> %H A338253 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A338253 Cf. A338251. %K A338253 nonn,look,base %O A338253 0,3 %A A338253 _Rémy Sigrist_, Oct 18 2020