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 A019299 #20 Jan 31 2023 16:02:56
%S A019299 1,2,4,9,18,37,75,150,300,601,1203,2406,4813,9626,19252,38505,77010,
%T A019299 154021,308043,616086,1232173,2464346,4928692,9857385,19714771,
%U A019299 39429542,78859084,157718169,315436338,630872677,1261745355,2523490710,5046981420
%N A019299 First n elements of Thue-Morse sequence A010059 read as a binary number.
%F A019299 a(n) = Sum_{k=0..n} (1+(-1)^A010060(n-k))*2^k/2. - _Paul Barry_, Jan 06 2005
%F A019299 From _Lorenzo Sauras Altuzarra_, Jan 31 2023: (Start)
%F A019299 a(n+1) = 2*a(n) + 1 if a(n) is evil; a(n+1) = 2*a(n) otherwise (see also A125050).
%F A019299 a(n) = floor((1-c)*2^(n+1)), where c = A014571 is the Thue - Morse constant. (End)
%p A019299 a:= n-> add((1+(-1)^irem(add(j, j=convert(n-i, base, 2)), 2))*2^i/2, i=0..n):
%p A019299 seq(a(n), n=0..32); # _Lorenzo Sauras Altuzarra_, Jan 31 2023
%Y A019299 Cf. A001969 (evil numbers), A010060, A014571, A125050.
%K A019299 nonn
%O A019299 0,2
%A A019299 _Jonas Wallgren_