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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8191 |
| 3 | 797161 |
| 4 | 33550336 |
| 5 | 305175781 |
| 6 | 6529545751 |
| 7 | 16148168401 |
| 8 | 137422176256 |
| 9 | 423644039001 |
| 10 | 2499694822171 |
| 11 | 3452271214393 |
| 12 | 26745019396096 |
| 13 | 25239592216021 |
| 14 | 132269647372591 |
| 15 | 243274230757741 |
| 16 | 562881233944576 |
| 17 | 619036127056621 |
[1,8191,797161,33550336,305175781,6529545751, 16148168401,137422176256,423644039001, 2499694822171,3452271214393,26745019396096, 25239592216021,132269647372591,243274230757741, 562881233944576,619036127056621] |