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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 60 |
| 3 | 1080 |
| 4 | 36720 |
| 5 | 2423520 |
| 6 | 315057600 |
| 7 | 81284860800 |
| 8 | 41780418451200 |
| 9 | 42866709330931200 |
| 10 | 87876754128408960000 |
| 11 | 360118938418219918080000 |
| 12 | 2950814581398894008747520000 |
| 13 | 48352047730802277227336862720000 |
[6,60,1080,36720,2423520,315057600,81284860800, 41780418451200,42866709330931200, 87876754128408960000,360118938418219918080000, 2950814581398894008747520000, 48352047730802277227336862720000] |