Which sequence matches the closed form an=2n−1a_n = 2^n - 1an=2n−1?
0,1,3,7,15,31,…0, 1, 3, 7, 15, 31, \ldots0,1,3,7,15,31,…
1,2,4,8,16,32,…1, 2, 4, 8, 16, 32, \ldots1,2,4,8,16,32,…
1,3,5,7,9,11,…1, 3, 5, 7, 9, 11, \ldots1,3,5,7,9,11,…
0,1,2,3,4,5,…0, 1, 2, 3, 4, 5, \ldots0,1,2,3,4,5,…