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 A330577 #10 Dec 19 2019 09:50:07 %S A330577 1,3,4,5,9,2,11,7,6,13,21,8,23,15,14,17,25,10,27,19,16,29,41,12,43,31, %T A330577 18,33,45,20,47,35,30,37,49,22,51,39,32,53,69,24,71,55,34,57,73,26,75, %U A330577 59,36,61,77,28,79,63,38,65,81,40,83,67,54,85,105,42,107 %N A330577 Inverse permutation to A330531. %H A330577 Rémy Sigrist, <a href="/A330577/b330577.txt">Table of n, a(n) for n = 1..10000</a> %H A330577 Rémy Sigrist, <a href="/A330577/a330577.gp.txt">PARI program for A330577</a> %H A330577 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %e A330577 A330531(2) = 6, hence a(6) = 2. %o A330577 (PARI) See Links section. %Y A330577 Cf. A330531. %K A330577 nonn %O A330577 1,2 %A A330577 _Rémy Sigrist_, Dec 18 2019