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 A349785 #6 Dec 05 2021 06:51:47
%S A349785 2,3,5,13,17,181,65,1873,1601,22033,1025,110120401,4097,3032641,
%T A349785 46240001,6563711233,65537,61178101070401,262145,3771115818193153,
%U A349785 270400000001,61977830401,4194305,27719934186822773256934560001,87578116097,8918277230593,10498871296000001
%N A349785 a(n) = 1 + Product_{k=1..n-1} a(gcd(n,k)).
%F A349785 a(n) = 1 + Product_{d|n, d < n} a(d)^phi(n/d).
%t A349785 a[n_] := a[n] = 1 + Product[a[GCD[n, k]], {k, 1, n - 1}]; Table[a[n], {n, 1, 27}]
%Y A349785 Cf. A000010, A000058, A051190, A338750, A343390.
%K A349785 nonn
%O A349785 1,1
%A A349785 _Ilya Gutkovskiy_, Nov 30 2021