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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 17 |
| 5 | 49 |
| 6 | 249 |
| 7 | 3481 |
| 8 | 80333 |
| 9 | 1943801 |
| 10 | 59816323 |
| 11 | 3493732595 |
| 12 | 338685091013 |
| 13 | 44460911929907 |
[1,1,1,17,49,249,3481,80333,1943801,59816323, 3493732595,338685091013,44460911929907] |