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

Terms

a(0) =2a(1) =1a(2) =1a(3) =3a(4) =3a(5) =7a(6) =3a(7) =18a(8) =7a(9) =18a(10) =7a(11) =123a(12) =7a(13) =322a(14) =18a(15) =47a(16) =47a(17) =2207a(18) =18a(19) =5778a(20) =47a(21) =322a(22) =123a(23) =39603a(24) =47a(25) =15127a(26) =322a(27) =5778a(28) =322a(29) =710647