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| n | a(n) |
|---|---|
| 7 | 0 |
| 8 | 10080 |
| 9 | 181440 |
| 10 | 2268000 |
| 11 | 24948000 |
| 12 | 261954000 |
| 13 | 2659456800 |
| 14 | 26789162400 |
| 15 | 287567280000 |
| 16 | 3321654336000 |
[0,10080,181440,2268000,24948000,261954000, 2659456800,26789162400,287567280000,3321654336000] |