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| n | a(n) |
|---|---|
| 1 | 720 |
| 2 | 3443212800 |
| 3 | 108051462804999168000 |
| 4 | 22246837484597339860644476682240000 |
| 5 | 30052178620241342579800569752518387643389968384000000 |
| 6 | 266350599470999830406351699267844906476060443517288646066593731706880000000 |
[720,3443212800,108051462804999168000, 22246837484597339860644476682240000, 30052178620241342579800569752518387643389968384000\ 000, 26635059947099983040635169926784490647606044351728\ 8646066593731706880000000] |