Find the value of a3a_3a3 if an=an−1+2an−2+na_n = a_{n-1} + 2a_{n-2} + nan=an−1+2an−2+n with a0=1,a1=1a_0=1, a_1=1a0=1,a1=1.
a3=11a_3 = 11a3=11
a3=12a_3 = 12a3=12
a3=10a_3 = 10a3=10
a3=9a_3 = 9a3=9