Given an=3an−1−2an−2a_n = 3a_{n-1} - 2a_{n-2}an=3an−1−2an−2 with a0=1a_0 = 1a0=1 and a1=5a_1 = 5a1=5, compute a4a_4a4.
313131
474747
656565
818181