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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 19 |
| 5 | 31 |
| 6 | 127 |
| 7 | 607 |
| 8 | 1279 |
| 9 | 2281 |
| 10 | 3217 |
| 11 | 4423 |
| 12 | 11213 |
| 13 | 23209 |
| 14 | 44497 |
| 15 | 132049 |
| 16 | 216091 |
| 17 | 1398269 |
| 18 | 3021377 |
| 19 | 6972593 |
| 20 | 13466917 |
| 21 | 43112609 |
[2,3,7,19,31,127,607,1279,2281,3217,4423,11213, 23209,44497,132049,216091,1398269,3021377,6972593, 13466917,43112609] |