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 A366716 #11 Jan 04 2024 15:36:00
%S A366716 1,12,112,1296,20416,229680,2306304,32916240,400515072,3863116800,
%T A366716 47825825600,685853880624,8732596764672,97509650382144,
%U A366716 990242755633152,11148606564480000,184883057981234176,2047145911595946000,20281543142263603200,294779525244632305920
%N A366716 a(n) = phi(12^n+1), where phi is Euler's totient function (A000010).
%H A366716 Max Alekseyev, <a href="/A366716/b366716.txt">Table of n, a(n) for n = 0..306</a>
%F A366716 a(n) = A000010(A178248(n)). - _Paul F. Marrero Romero_, Oct 27 2023
%t A366716 EulerPhi[12^Range[0,19] + 1] (* _Paul F. Marrero Romero_, Oct 27 2023 *)
%o A366716 (PARI) {a(n) = eulerphi(12^n+1)}
%Y A366716 Cf. A178248, A000010, A366711, A366712, A366713, A366714, A366715, A366719, A366720, A366690.
%K A366716 nonn
%O A366716 0,2
%A A366716 _Sean A. Irvine_, Oct 17 2023