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| n | a(n) |
|---|---|
| 1 | 60 |
| 2 | 979200 |
| 3 | 4106059776000 |
| 4 | 4408780839651901440000 |
| 5 | 1211875293642881119668928512000000 |
| 6 | 85278137430613949474674174708223909560320000000 |
[60,979200,4106059776000,4408780839651901440000, 1211875293642881119668928512000000, 85278137430613949474674174708223909560320000000] |