Solving the recurrence relation an=an−1+20an−2a_n = a_{n-1} + 20a_{n-2}an=an−1+20an−2, a0=−1a_0 = -1a0=−1, a1=−1a_1 = -1a1=−1, ∀n≥2\forall n \ge 2∀n≥2, using generating function G(z)G(z)G(z), which following parts are true?
