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 A333777 #8 Apr 07 2020 12:19:56
%S A333777 0,1,2,3,4,6,5,7,8,12,10,13,9,14,11,15,16,24,20,25,18,26,21,27,17,28,
%T A333777 22,30,19,29,23,31,32,48,40,49,36,50,41,51,34,52,42,54,37,53,43,55,33,
%U A333777 56,44,60,38,58,46,61,35,57,45,62,39,59,47,63,64,96,80,97
%N A333777 Inverse permutation to A333776.
%H A333777 Rémy Sigrist, <a href="/A333777/b333777.txt">Table of n, a(n) for n = 0..8192</a>
%H A333777 <a href="/index/Bi#binary">Index entries for sequences related to binary expansion of n</a>
%H A333777 <a href="/index/Per#IntegerPermutation">Index entries for sequences that are permutations of the natural numbers</a>
%e A333777 A333776(90) = 106, hence a(106) = 96.
%o A333777 (PARI) a(n, base=2) = { my (d=Vecrev(digits(n, base)), v=0); forstep (k=#d, 1, -1, v += d[k]*base^(k-1); if (d[k], d=Vecrev(d[1..k-1]))); v }
%Y A333777 Cf. A333776.
%K A333777 nonn,base
%O A333777 0,3
%A A333777 _Rémy Sigrist_, Apr 05 2020