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| n | a(n) |
|---|---|
| 9 | 0 |
| 10 | 907200 |
| 11 | 19958400 |
| 12 | 299376000 |
| 13 | 3891888000 |
| 14 | 47675628000 |
| 15 | 572107536000 |
[0,907200,19958400,299376000,3891888000, 47675628000,572107536000] |