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 A361939 #6 Apr 01 2023 08:50:24 %S A361939 1,2,4,3,7,5,11,16,6,8,22,29,37,12,9,17,46,56,67,10,13,23,79,18,92,38, %T A361939 106,14,121,137,154,19,24,47,15,30,172,68,39,20,191,211,232,25,254,80, %U A361939 277,21,301,93,48,40,326,57,26,352,69,122,379,31,407,155,436 %N A361939 Inverse permutation to A361748. %H A361939 Rémy Sigrist, <a href="/A361939/a361939.gp.txt">PARI program</a> %H A361939 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %e A361939 A361748(10) = 20, so a(20) = 10. %o A361939 (PARI) See Links section. %Y A361939 Cf. A361748. %K A361939 nonn %O A361939 1,2 %A A361939 _Rémy Sigrist_, Mar 31 2023