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 A365279 #10 Sep 03 2023 11:33:07 %S A365279 0,1,3,2,7,15,6,31,63,4,5,11,14,127,255,30,511,1023,12,13,27,62,2047, %T A365279 4095,126,8191,16383,8,9,19,10,23,47,22,95,191,28,29,59,254,32767, %U A365279 65535,510,131071,262143,60,61,123,1022,524287,1048575,2046,2097151,4194303 %N A365279 Inverse permutation to A365278. %H A365279 Rémy Sigrist, <a href="/A365279/b365279.txt">Table of n, a(n) for n = 0..6561</a> %H A365279 Rémy Sigrist, <a href="/A365279/a365279.gp.txt">PARI program</a> %H A365279 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a> %F A365279 a(3*n) = 2*a(n). %F A365279 a(A032924(k)) = 2^k - 1 for any k > 0. %F A365279 A023416(a(n)) = A077267(n). %e A365279 A365278(42) = 273, hence a(273) = 42. %o A365279 (PARI) See Links section. %Y A365279 Cf. A023416, A032924, A077267, A365278. %K A365279 nonn,base %O A365279 0,3 %A A365279 _Rémy Sigrist_, Aug 31 2023