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 A338247 #7 Oct 18 2020 22:33:11 %S A338247 0,1,4,2,3,13,11,12,7,5,6,10,8,9,40,38,39,34,32,33,37,35,36,22,20,21, %T A338247 16,14,15,19,17,18,31,29,30,25,23,24,28,26,27,121,119,120,115,113,114, %U A338247 118,116,117,103,101,102,97,95,96,100,98,99,112,110,111,106 %N A338247 Inverse permutation to A338245. %H A338247 Rémy Sigrist, <a href="/A338247/b338247.txt">Table of n, a(n) for n = 0..9841</a> %H A338247 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %Y A338247 Cf. A338245. %K A338247 nonn,base %O A338247 0,3 %A A338247 _Rémy Sigrist_, Oct 18 2020