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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 22 |
| 4 | 351 |
| 5 | 11275 |
| 6 | 689146 |
| 7 | 76718466 |
| 8 | 15016410213 |
| 9 | 5018597151979 |
| 10 | 2793390337774000 |
| 11 | 2534303740130716491 |
| 12 | 3677548139455638020060 |
| 13 | 8393668597786379602398164 |
| 14 | 29683833854927200499142474520 |
| 15 | 160463839044675821511377573062150 |
| 16 | 1309702228155431081923017737636343876 |
[1,1,3,22,351,11275,689146,76718466,15016410213, 5018597151979,2793390337774000, 2534303740130716491,3677548139455638020060, 8393668597786379602398164, 29683833854927200499142474520, 160463839044675821511377573062150, 1309702228155431081923017737636343876] |