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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 5 |
| 3 | 37 |
| 4 | 401 |
| 5 | 1321 |
| 6 | 3121 |
| 7 | 3137 |
| 8 | 4297 |
| 9 | 7537 |
| 10 | 44809 |
| 11 | 68141 |
| 12 | 788369 |
| 13 | 1688329 |
| 14 | 65824021 |
| 15 | 215002409 |
| 16 | 813847757 |
[2,5,37,401,1321,3121,3137,4297,7537,44809,68141, 788369,1688329,65824021,215002409,813847757] |