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| n | a(n) |
|---|---|
| 2 | 3 |
| 3 | 60 |
| 4 | 728 |
| 5 | 10416 |
| 6 | 116064 |
| 7 | 2837120 |
| 8 | 36990720 |
| 9 | 1452853584 |
| 10 | 27615698352 |
| 11 | 965243666880 |
| 12 | 23861701899840 |
| 13 | 1355882884941312 |
| 14 | 20758574413420992 |
| 15 | 1604569397488307712 |
| 16 | 93340493714183159808 |
| 17 | 3135286584767445151680 |
| 18 | 90560273718863022770592 |
| 19 | 8284620870197084160000000 |
[3,60,728,10416,116064,2837120,36990720, 1452853584,27615698352,965243666880, 23861701899840,1355882884941312,20758574413420992, 1604569397488307712,93340493714183159808, 3135286584767445151680,90560273718863022770592, 8284620870197084160000000] |