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| n | a(n) |
|---|---|
| 9 | 40320 |
| 10 | 3628800 |
| 11 | 219542400 |
| 12 | 11496038400 |
| 13 | 570031862400 |
| 14 | 27908676956160 |
| 15 | 1379187810000000 |
| 16 | 69648048665395200 |
| 17 | 3619848890071814400 |
| 18 | 194427690066299289600 |
| 19 | 10817193383227574703360 |
| 20 | 624124327363867459584000 |
| 21 | 37361601302439627939398400 |
| 22 | 2320453709453248711940505600 |
[40320,3628800,219542400,11496038400,570031862400, 27908676956160,1379187810000000,69648048665395200, 3619848890071814400,194427690066299289600, 10817193383227574703360,624124327363867459584000, 37361601302439627939398400, 2320453709453248711940505600] |