a(0) = 3; thereafter, a(n) = a(n-1)^2 - 2.A001566a(0) = 3; thereafter, a(n) = a(n-1)^2 - 2.Terms a(0) =3a(1) =7a(2) =47a(3) =2207a(4) =4870847External referencesoeis: A001566