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 A338254 #8 Oct 20 2020 19:00:42 %S A338254 0,1,2,4,3,5,6,9,10,8,7,17,18,16,15,12,11,13,14,20,19,21,22,25,26,24, %T A338254 23,36,35,37,38,41,42,40,39,33,34,32,31,28,27,29,30,68,67,69,70,73,74, %U A338254 72,71,65,66,64,63,60,59,61,62,49,50,48,47,44,43,45,46,52 %N A338254 Inverse permutation to A338252. %H A338254 Rémy Sigrist, <a href="/A338254/b338254.txt">Table of n, a(n) for n = 0..10922</a> %H A338254 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A338254 Cf. A338252. %K A338254 nonn,look,base %O A338254 0,3 %A A338254 _Rémy Sigrist_, Oct 18 2020