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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 18 |
| 4 | 288 |
| 5 | 7200 |
| 6 | 259200 |
| 7 | 12700800 |
| 8 | 812851200 |
| 9 | 65840947200 |
| 10 | 6584094720000 |
| 11 | 796675461120000 |
| 12 | 114721266401280000 |
| 13 | 19387894021816320000 |
| 14 | 3800027228275998720000 |
| 15 | 855006126362099712000000 |
[2,18,288,7200,259200,12700800,812851200, 65840947200,6584094720000,796675461120000, 114721266401280000,19387894021816320000, 3800027228275998720000,855006126362099712000000] |