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 A343313 #9 Apr 15 2021 01:08:25 %S A343313 0,1,2,4,3,5,7,9,11,13,12,8,10,6,14,16,18,20,24,30,22,28,26,32,34,36, %T A343313 38,40,39,35,37,33,25,27,21,29,31,23,17,19,15,41,43,45,47,51,57,49,55, %U A343313 53,59,63,69,71,79,93,77,91,89,61,67,65,75,87,85,73,83,81 %N A343313 Inverse permutation to A343312. %C A343313 This sequence has interesting graphical features. %H A343313 Rémy Sigrist, <a href="/A343313/b343313.txt">Table of n, a(n) for n = 0..9842</a> %H A343313 Rémy Sigrist, <a href="/A343313/a343313.png">Scatterplot of the sequence for n = 0..3^9</a> %H A343313 Rémy Sigrist, <a href="/A343313/a343313.gp.txt">PARI program for A343313</a> %H A343313 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %e A343313 A343312(42) = 121, so a(121) = 42. %o A343313 (PARI) See Links section. %Y A343313 Cf. A343312. %K A343313 nonn,base %O A343313 0,3 %A A343313 _Rémy Sigrist_, Apr 14 2021