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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 441 |
| 3 | 4352 |
| 4 | 94320 |
| 5 | 3654505 |
| 6 | 66462504 |
| 7 | 1659712320 |
| 8 | 45752436553 |
| 9 | 1014943340640 |
| 10 | 25160568710560 |
| 11 | 635057168205273 |
| 12 | 15056010708049352 |
| 13 | 370239981042453456 |
| 14 | 9120915650958923337 |
| 15 | 220779580837062915520 |
| 16 | 5407745104882678660128 |
[0,441,4352,94320,3654505,66462504,1659712320, 45752436553,1014943340640,25160568710560, 635057168205273,15056010708049352, 370239981042453456,9120915650958923337, 220779580837062915520,5407745104882678660128] |