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| n | a(n) |
|---|---|
| 2 | 6 |
| 3 | 36 |
| 4 | 240 |
| 5 | 2520 |
| 6 | 30240 |
| 7 | 443520 |
| 8 | 6652800 |
| 9 | 133056000 |
| 10 | 2075673600 |
| 11 | 58118860800 |
| 12 | 1270312243200 |
| 13 | 29640619008000 |
| 14 | 844757641728000 |
| 15 | 25342729251840000 |
| 16 | 810967336058880000 |
| 17 | 27978373094031360000 |
| 18 | 1077167364120207360000 |
| 19 | 43086694564808294400000 |
| 20 | 1499416970855328645120000 |
[6,36,240,2520,30240,443520,6652800,133056000, 2075673600,58118860800,1270312243200, 29640619008000,844757641728000,25342729251840000, 810967336058880000,27978373094031360000, 1077167364120207360000,43086694564808294400000, 1499416970855328645120000] |