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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 12 |
| 3 | 2988 |
| 4 | 375620 |
| 5 | 36327118 |
| 6 | 10140483166 |
| 7 | 1844073908022 |
| 8 | 383056487876288 |
| 9 | 74556370297711856 |
| 10 | 14997676327239628696 |
[0,12,2988,375620,36327118,10140483166, 1844073908022,383056487876288,74556370297711856, 14997676327239628696] |