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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 672 |
| 4 | 30240 |
| 5 | 32760 |
| 6 | 23569920 |
| 7 | 45532800 |
| 8 | 14182439040 |
| 9 | 51001180160 |
| 10 | 153003540480 |
| 11 | 403031236608 |
| 12 | 518666803200 |
| 13 | 13661860101120 |
| 14 | 740344994887680 |
| 15 | 796928461056000 |
| 16 | 212517062615531520 |
| 17 | 87934476737668055040 |
| 18 | 154345556085770649600 |
| 19 | 170206605192656148480 |
[1,6,672,30240,32760,23569920,45532800, 14182439040,51001180160,153003540480,403031236608, 518666803200,13661860101120,740344994887680, 796928461056000,212517062615531520, 87934476737668055040,154345556085770649600, 170206605192656148480] |