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 A122569 #18 Feb 16 2025 08:33:02
%S A122569 1,1,9,105,38505,1771476585,10838310072981296745,
%T A122569 140350834813144189858090274002849666665,
%U A122569 68033174967769840440887906939858451149105560803546820641877549596291376780905
%N A122569 Consider the Thue-Morse sequence (A010059) at each iteration. Read each reversed string as a binary number and convert it to a decimal number.
%H A122569 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Thue-MorseSequence.html">Thue-Morse Sequence</a>
%F A122569 T(n,m)=ThueMorse(n, 1), a(n) = Sum_{m=1..2^(n - 1)} T(n,m)*2^(m - 1).
%t A122569 FromDigits[ #, 2] & /@ NestList[Flatten[ # /. {1 -> {0, 1}, 0 -> {1, 0}}] &, {1}, 8] (* _Robert G. Wilson v_, Sep 25 2006 *)
%Y A122569 Cf. A010059.
%K A122569 nonn,base
%O A122569 1,3
%A A122569 _Roger L. Bagula_, Sep 17 2006
%E A122569 Edited by _Robert G. Wilson v_, Sep 25 2006