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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 110 |
| 2 | 1597200 |
| 3 | 2827411356000 |
| 4 | 606039338269189440000 |
| 5 | 15719002038355567350156912000000 |
| 6 | 49332934203739383347738694321468865920000000 |
[1,110,1597200,2827411356000, 606039338269189440000, 15719002038355567350156912000000, 49332934203739383347738694321468865920000000] |