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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 14 |
| 5 | 96 |
| 6 | 729 |
| 7 | 6842 |
| 8 | 71861 |
| 9 | 869936 |
| 10 | 11639208 |
| 11 | 172823592 |
| 12 | 2797075786 |
| 13 | 49197117648 |
| 14 | 931938081060 |
| 15 | 18931744650296 |
| 16 | 410210251648404 |
| 17 | 9443418462484224 |
| 18 | 230108297407058144 |
| 19 | 5915598580747789632 |
| 20 | 159987606074180375904 |
| 21 | 4539874767394840811904 |
[1,1,3,14,96,729,6842,71861,869936,11639208, 172823592,2797075786,49197117648,931938081060, 18931744650296,410210251648404,9443418462484224, 230108297407058144,5915598580747789632, 159987606074180375904,4539874767394840811904] |