a(n) = a(n-1)^2 - 1, a(0) = 2.A003096a(n) = a(n-1)^2 - 1, a(0) = 2.Terms a(0) =2a(1) =3a(2) =8a(3) =63a(4) =3968a(5) =15745023External referencesoeis: A003096