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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 60 |
| 4 | 2520 |
| 5 | 55440 |
| 6 | 720720 |
| 7 | 367567200 |
| 8 | 6983776800 |
| 9 | 321253732800 |
| 10 | 65214507758400 |
| 11 | 6064949221531200 |
| 12 | 448806242393308800 |
| 13 | 18401055938125660800 |
| 14 | 791245405339403414400 |
| 15 | 37188534050951960476800 |
| 16 | 9854961523502269526352000 |
| 17 | 581442729886633902054768000 |
| 18 | 780296143507862696557498656000 |
[2,6,60,2520,55440,720720,367567200,6983776800, 321253732800,65214507758400,6064949221531200, 448806242393308800,18401055938125660800, 791245405339403414400,37188534050951960476800, 9854961523502269526352000, 581442729886633902054768000, 780296143507862696557498656000] |