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 A080813 #19 Dec 19 2023 07:12:20
%S A080813 1,1,0,1,1,0,0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0,1,0,0,1,0,1,1,0,0,1,1,0,
%T A080813 1,0,0,1,1,0,0,1,0,1,1,0,0,1,1,0,1,0,0,1,0,1,1,0,1,0,0,1,1,0,0,1,0,1,
%U A080813 1,0,1,0,0,1,0,1,1,0,0,1,1,0,1,0,0,1,0,1,1,0,1,0,0,1,1,0,0,1,0,1,1,0,0,1,1,0,1,0
%N A080813 Lexicographically largest overlap-free binary sequence.
%H A080813 J.-P. Allouche and Jeffrey Shallit, <a href="https://cs.uwaterloo.ca/~shallit/Papers/ubiq15.pdf">The Ubiquitous Prouhet-Thue-Morse Sequence</a>, in C. Ding. T. Helleseth and H. Niederreiter, eds., Sequences and Their Applications: Proceedings of SETA '98, Springer-Verlag, 1999, pp. 1-16.
%F A080813 1, 1, 0, 1, 1, 0 followed by A010060.
%t A080813 Join[{1,1,0,1,1,0},ThueMorse[Range[0,200]]] (* _Paolo Xausa_, Dec 19 2023 *)
%Y A080813 Cf. A010060.
%K A080813 nonn
%O A080813 1,1
%A A080813 _N. J. A. Sloane_, Mar 26 2003