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 A361647 #9 Mar 21 2023 15:03:51 %S A361647 0,1,2,3,4,6,7,5,8,10,12,13,14,15,11,9,16,18,20,21,24,28,29,25,26,30, %T A361647 31,27,22,23,19,17,32,34,36,37,40,44,45,41,48,52,56,57,58,59,53,49,50, %U A361647 54,60,61,62,63,55,51,42,46,47,43,38,39,35,33,64,66,68,69 %N A361647 Inverse permutation to A361646. %H A361647 Rémy Sigrist, <a href="/A361647/b361647.txt">Table of n, a(n) for n = 0..8192</a> %H A361647 Rémy Sigrist, <a href="/A361647/a361647.gp.txt">PARI program</a> %H A361647 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A361647 a(n) < 2^k iff n < 2^k. %e A361647 A361646(42) = 56, so a(56) = 42. %o A361647 (PARI) See Links section. %Y A361647 Cf. A361646. %K A361647 nonn,base %O A361647 0,3 %A A361647 _Rémy Sigrist_, Mar 19 2023