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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 153 |
| 4 | 3825 |
| 5 | 126225 |
| 6 | 5175225 |
| 7 | 253586025 |
| 8 | 14454403425 |
| 9 | 939536222625 |
| 10 | 68586144251625 |
| 11 | 5555477684381625 |
| 12 | 494437513909964625 |
| 13 | 47960438849266568625 |
| 14 | 5035846079172989705625 |
| 15 | 569050606946547836735625 |
| 16 | 68855123440532288245010625 |
| 17 | 8882310923828665183606370625 |
[1,1,9,153,3825,126225,5175225,253586025, 14454403425,939536222625,68586144251625, 5555477684381625,494437513909964625, 47960438849266568625,5035846079172989705625, 569050606946547836735625, 68855123440532288245010625, 8882310923828665183606370625] |