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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 9 |
| 3 | 240 |
| 4 | 36864 |
| 5 | 7741440 |
| 6 | 3363235524 |
| 7 | 2203143038208 |
| 8 | 2248347011420160 |
| 9 | 3260265586467690240 |
| 10 | 6578570637254005920000 |
| 11 | 17755898734939822501524480 |
| 12 | 62673017366111480630785474560 |
| 13 | 282641923592380319367599892725760 |
| 14 | 1599753679036773033206787507696238848 |
[1,0,9,240,36864,7741440,3363235524,2203143038208, 2248347011420160,3260265586467690240, 6578570637254005920000,17755898734939822501524480, 62673017366111480630785474560, 282641923592380319367599892725760, 1599753679036773033206787507696238848] |