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 A280132 #13 Sep 08 2024 19:25:33
%S A280132 1,1,2,4,16,64,384,3072,36864,589824,5898240,188743680,2264924160,
%T A280132 81537269760,5218385264640,333976656936960,5343626510991360,
%U A280132 769482217582755840,13850679916489605120,3545774058621338910720,510591464441472803143680,51059146444147280314368000
%N A280132 Partial products of A029940 (Product_{d|n} phi(d)).
%C A280132 phi(n) is the number of totatives of n (A000010).
%F A280132 a(n) = Product_{i=1..n} A029940(i).
%t A280132 FoldList[Times[#1, #2] &, Array[Product[EulerPhi@ d, {d, Divisors@ #}] &, 22]] (* _Michael De Vlieger_, Dec 27 2016 *)
%o A280132 (Magma) [&*[&*[EulerPhi(d): d in Divisors(k)]: k in [1..n]]: n in [1..100]];
%Y A280132 Cf. A000010, A029940, A280131 (partial sums of A029940), A280133 (partial products of A057661).
%K A280132 nonn
%O A280132 1,3
%A A280132 _Jaroslav Krizek_, Dec 27 2016