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 A197191 #14 Sep 08 2022 08:45:59
%S A197191 1,1,6,36,2206,150000,13685760,16794009904,23538338288640,
%T A197191 40111742758242240,678603619866009600000,19289305175281390070751204,
%U A197191 619856418580365858926902640640,208006459829483370218035382709089280,78451383926677134672195807581733722937984
%N A197191 a(n) = phi(Lucas(n^2)).
%H A197191 Vincenzo Librandi, <a href="/A197191/b197191.txt">Table of n, a(n) for n = 0..20</a>
%t A197191 Table[EulerPhi[LucasL[n^2]], {n, 0, 15}] (* _Vincenzo Librandi_, Oct 04 2013 *)
%o A197191 (Magma) [EulerPhi(Lucas(n^2)): n in [0..15]]
%Y A197191 Cf. A197218, A197219.
%K A197191 nonn
%O A197191 0,3
%A A197191 _Vincenzo Librandi_, Oct 13 2011