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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 11 |
| 2 | 47 |
| 3 | 191 |
| 4 | 767 |
| 5 | 3071 |
| 6 | 12287 |
| 7 | 49151 |
| 8 | 196607 |
| 9 | 786431 |
| 10 | 3145727 |
| 11 | 12582911 |
| 12 | 50331647 |
| 13 | 201326591 |
| 14 | 805306367 |
| 15 | 3221225471 |
| 16 | 12884901887 |
| 17 | 51539607551 |
| 18 | 206158430207 |
| 19 | 824633720831 |
| 20 | 3298534883327 |
| 21 | 13194139533311 |
| 22 | 52776558133247 |
[2,11,47,191,767,3071,12287,49151,196607,786431, 3145727,12582911,50331647,201326591,805306367, 3221225471,12884901887,51539607551,206158430207, 824633720831,3298534883327,13194139533311, 52776558133247] |