n | a(n) |
---|---|
0 | -1 |
1 | 1 |
2 | 11 |
3 | 55 |
4 | 239 |
5 | 991 |
6 | 4031 |
7 | 16255 |
8 | 65279 |
9 | 261631 |
10 | 1047551 |
11 | 4192255 |
12 | 16773119 |
13 | 67100671 |
14 | 268419071 |
15 | 1073709055 |
16 | 4294901759 |
17 | 17179738111 |
18 | 68719214591 |
19 | 274877382655 |
20 | 1099510579199 |
21 | 4398044413951 |
22 | 17592181850111 |
23 | 70368735789055 |
[-1,1,11,55,239,991,4031,16255,65279,261631, 1047551,4192255,16773119,67100671,268419071, 1073709055,4294901759,17179738111,68719214591, 274877382655,1099510579199,4398044413951, 17592181850111,70368735789055] |