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| n | a(n) |
|---|---|
| 8 | 0 |
| 9 | 75600 |
| 10 | 1077840 |
| 11 | 10553640 |
| 12 | 86272536 |
| 13 | 636428922 |
| 14 | 4429638754 |
| 15 | 29936160747 |
| 16 | 200258110593 |
| 17 | 1350025656107 |
| 18 | 9269884625133 |
| 19 | 64294692046060 |
| 20 | 447678000251572 |
| 21 | 3115603246683600 |
| 22 | 21610322604575616 |
| 23 | 149157054284148864 |
| 24 | 1023951079104952320 |
| 25 | 6994818732341176704 |
[0,75600,1077840,10553640,86272536,636428922, 4429638754,29936160747,200258110593,1350025656107, 9269884625133,64294692046060,447678000251572, 3115603246683600,21610322604575616, 149157054284148864,1023951079104952320, 6994818732341176704] |