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 A380182 #7 Jan 17 2025 16:31:42 %S A380182 0,1,4,3,2,13,12,11,10,8,7,9,6,5,40,39,38,37,35,34,36,33,32,31,29,28, %T A380182 25,21,20,24,19,18,30,27,26,23,17,16,22,15,14,121,120,119,118,116,115, %U A380182 117,114,113,112,110,109,106,102,101,105,100,99,111,108,107 %N A380182 Inverse permutation to A380181. %H A380182 Rémy Sigrist, <a href="/A380182/b380182.txt">Table of n, a(n) for n = 0..9841</a> %H A380182 Rémy Sigrist, <a href="/A380182/a380182.gp.txt">PARI program</a> %H A380182 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %e A380182 A380181(42) = 120, so a(120) = 42. %o A380182 (PARI) \\ See Links section. %Y A380182 Cf. A380181. %K A380182 nonn,base %O A380182 0,3 %A A380182 _Rémy Sigrist_, Jan 15 2025