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 A225081 #5 Apr 29 2013 12:40:08 %S A225081 1,2,1,2,4,2,1,2,4,8,4,2,4,2,1,2,4,8,4,8,16,8,4,2,4,8,4,2,4,2,1,2,4,8, %T A225081 4,8,16,8,4,8,16,32,16,8,16,8,4,2,4,8,4,8,16,8,4,2,4,8,4,2,4,2,1,2,4, %U A225081 8,4,8,16,8,4,8,16,32,16,8,16,8,4,8,16,32,16,32,64,32,16,8,16,32,16,8,16,8,4 %N A225081 Gray code variant of A048896. %C A225081 Has a different permutation of the same terms in A048896 through the 2^n-th term. %C A225081 Uses the Gray code weight (gt) in A005811 instead of the binary weight (wt) in A000120. %F A225081 2^(A005811(n+1)-1), n>=0. %e A225081 a(8) = 4 = 2^2 since A005811(9) = 3. %Y A225081 Cf. A048896, A005811. %K A225081 nonn %O A225081 0,2 %A A225081 _Gary W. Adamson_, Apr 26 2013