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 A380186 #6 Jan 17 2025 16:31:56 %S A380186 0,1,2,5,4,3,10,9,7,8,6,21,20,19,18,16,14,13,17,15,12,11,42,41,39,40, %T A380186 38,37,36,35,31,29,25,27,24,34,33,32,30,28,23,26,22,85,84,83,82,80,78, %U A380186 77,81,79,76,75,74,73,71,72,70,64,62,61,58,54,50,49,56,53 %N A380186 Inverse permutation to A380185. %H A380186 Rémy Sigrist, <a href="/A380186/b380186.txt">Table of n, a(n) for n = 0..5461</a> %H A380186 Rémy Sigrist, <a href="/A380186/a380186.gp.txt">PARI program</a> %H A380186 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %e A380186 A380185(42) = 22, so a(22) = 42. %o A380186 (PARI) \\ See Links section. %Y A380186 Cf. A380185. %K A380186 nonn,base %O A380186 0,3 %A A380186 _Rémy Sigrist_, Jan 15 2025