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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 120 |
| 2 | 372000 |
| 3 | 29016000000 |
| 4 | 56653740000000000 |
| 5 | 2766118855500000000000000 |
| 6 | 3376566710423156250000000000000000 |
| 7 | 103044374585338670859375000000000000000000000 |
[1,120,372000,29016000000,56653740000000000, 2766118855500000000000000, 3376566710423156250000000000000000, 103044374585338670859375000000000000000000000] |