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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 60 |
| 4 | 43566 |
| 5 | 124446770 |
| 6 | 2846678305070 |
| 7 | 441589771066454894 |
| 8 | 487992556962953668919304 |
[0,2,60,43566,124446770,2846678305070, 441589771066454894,487992556962953668919304] |