What is the result of the recursive formula an=an−1+2n−1a_n = a_{n-1} + 2n - 1an=an−1+2n−1 with a0=0a_0 = 0a0=0?
an=n2a_n = n^2an=n2
an=2na_n = 2nan=2n
an=n(n+1)a_n = n(n+1)an=n(n+1)
an=2n−1a_n = 2^n - 1an=2n−1