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 A074073 #16 Feb 16 2025 08:32:47 %S A074073 1,4,8,256,32768,4294967296,9223372036854775808, %T A074073 340282366920938463463374607431768211456, %U A074073 57896044618658097711785492504343953926634992332820282019728792003956564819968 %N A074073 Denominators of iterations of Thue-Morse sequence. %H A074073 Amiram Eldar, <a href="/A074073/b074073.txt">Table of n, a(n) for n = 0..12</a> %H A074073 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/Thue-MorseConstant.html">Thue-Morse Constant</a>. %t A074073 f[0] = 0; f[n_] := (2^(-2^n))*(2^(2^(n - 1)) - 1)*(2^(2^(n - 1))*f[n - 1] + 1); Denominator@ Array[f, 9, 0] (* _Amiram Eldar_, Oct 05 2023 *) %Y A074073 Cf. A074072 (numerators). %K A074073 nonn,frac,easy %O A074073 0,2 %A A074073 _Eric W. Weisstein_, Aug 18 2002 %E A074073 a(8) from _Amiram Eldar_, Oct 05 2023