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 A059152 #9 Feb 28 2019 20:45:37
%S A059152 4,16,4,64,4,16,4,256,4,16,4,64,4,16,4,1024,4,16,4,64,4,16,4,256,4,16,
%T A059152 4,64,4,16,4,4096,4,16,4,64,4,16,4,256,4,16,4,64,4,16,4,1024,4,16,4,
%U A059152 64,4,16,4,256,4,16,4,64,4,16,4,16384,4,16,4,64,4,16,4,256,4,16,4,64,4,16
%N A059152 A hierarchical sequence (W'2{2}c - see A059126).
%H A059152 J. Wallgren, <a href="/A059126/a059126.txt">Hierarchical sequences</a>
%F A059152 a(n) = 4*4^A007814(n). - _Mitch Harris_, Jun 29 2005
%Y A059152 Cf. A007814, A059126.
%K A059152 easy,nonn
%O A059152 0,1
%A A059152 _Jonas Wallgren_, Feb 02 2001