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 A371591 #9 Apr 14 2024 10:03:58 %S A371591 0,1,2,4,3,8,5,6,16,9,10,11,7,32,17,18,19,12,20,13,14,64,33,34,35,21, %T A371591 36,22,23,37,24,25,26,15,128,65,66,67,38,68,39,40,69,41,42,43,27,70, %U A371591 44,45,46,28,47,29,30,256,129,130,131,71,132,72,73,133,74,75 %N A371591 Inverse permutation to A371590. %H A371591 Rémy Sigrist, <a href="/A371591/a371591.gp.txt">PARI program</a> %H A371591 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %e A371591 A371590(42) = 44, so a(44) = 42. %o A371591 (PARI) \\ See Links section. %Y A371591 Cf. A371590. %K A371591 nonn,base %O A371591 0,3 %A A371591 _Rémy Sigrist_, Mar 28 2024