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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 144 |
| 3 | 3888 |
| 4 | 62208 |
| 5 | 777600 |
| 6 | 8398080 |
| 7 | 82301184 |
| 8 | 752467968 |
| 9 | 6530347008 |
| 10 | 54419558400 |
| 11 | 438984437760 |
| 12 | 3448023220224 |
| 13 | 26487087464448 |
| 14 | 199671890116608 |
| 15 | 1481082701414400 |
| 16 | 10833062044631040 |
| 17 | 78268873272459264 |
[0,144,3888,62208,777600,8398080,82301184, 752467968,6530347008,54419558400,438984437760, 3448023220224,26487087464448,199671890116608, 1481082701414400,10833062044631040, 78268873272459264] |