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 A059128 #8 Sep 12 2022 22:48:39
%S A059128 1,2,1,3,4,3,1,2,1,5,6,5,7,8,7,5,6,5,1,2,1,3,4,3,1,2,1,9,10,9,11,12,
%T A059128 11,9,10,9,1,2,1,3,4,3,1,2,1,5,6,5,7,8,7,5,6,5,1,2,1,3,4,3,1,2,1,13,
%U A059128 14,13,15,16,15,13,14,13,1,2,1,3,4,3,1,2,1,5,6,5,7,8,7,5,6,5,1,2,1,3,4,3,1,2
%N A059128 A hierarchical sequence (W3{2,2} - see A059126).
%H A059128 J. Wallgren, <a href="/A059126/a059126.txt">Hierarchical sequences</a>
%F A059128 a(3n+1) = 2*A059126(1+n), a(3n) = a(3n+2) = a(3n+1) - 1. - _Sean A. Irvine_, Sep 12 2022
%K A059128 easy,nonn
%O A059128 0,2
%A A059128 _Jonas Wallgren_, Jan 19 2001