What is the closed form for an=an−1+3a_n = a_{n-1} + 3an=an−1+3 with a0=1a_0 = 1a0=1?
an=1+n3a_n = 1 + n^3an=1+n3
an=3n+1a_n = 3n + 1an=3n+1
an=3na_n = 3nan=3n
an=3na_n = 3^nan=3n