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 A179020 #8 Mar 31 2017 00:41:56
%S A179020 1,1,0,0,0,0,1,1,0,0,1,1,1,1,0,0,0,0,1,1,1,1,0,0,1,1,0,0,0,0,1,1,0,0,
%T A179020 1,1,1,1,0,0,1,1,0,0,0,0,1,1,1,1,0,0,0,0,1,1,0,0,1,1,1,1,0,0,0,0,1,1,
%U A179020 1,1,0,0,1,1,0,0,0,0,1,1,1,1,0,0,0,0,1,1,0,0,1,1,1,1,0,0,1,1,0,0,0,0,1,1,0
%N A179020 Doubled Thue-Morse sequence: the A010059 sequence replacing 0 with 0,0 and 1 with 1,1.
%C A179020 A143579(n) - n if n even; n - A143579(n) if n odd.
%F A179020 a(n)= 1 - A095190(n).
%t A179020 Nest[ Flatten[ # /. {0 -> {0, 1}, 1 -> {1, 0}}] &, {1}, 6] /. {0 -> {0, 0}, 1 -> {1, 1}} // Flatten (* _Robert G. Wilson v_, Jun 27 2010 *)
%K A179020 nonn
%O A179020 0,1
%A A179020 _Philippe Deléham_, Jun 25 2010
%E A179020 More terms from _Robert G. Wilson v_, Jun 27 2010