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a(0) = 2, a(n) = Lucas(phi(n^2)) for n > 0.
1

%I #18 Nov 30 2022 17:27:26

%S 2,1,3,18,47,15127,322,599074578,4870847,192900153618,228826127,

%T 97418273275323406890123,10749957122,

%U 400010949097364802732720796316482,358890350005878082,11981655542024930675232002,562882766124611619513723647,699259133978938420550028971714417160188479526095241271647

%N a(0) = 2, a(n) = Lucas(phi(n^2)) for n > 0.

%H Vincenzo Librandi, <a href="/A197190/b197190.txt">Table of n, a(n) for n = 0..60</a>

%o (Magma) [2], [Lucas(EulerPhi(n^2)): n in [1..20]]

%Y Cf. A197218, A197219.

%K nonn

%O 0,1

%A _Vincenzo Librandi_, Oct 13 2011