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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 120 |
| 2 | 3628800 |
| 3 | 1307674368000 |
| 4 | 2432902008176640000 |
| 5 | 15511210043330985984000000 |
| 6 | 265252859812191058636308480000000 |
| 7 | 10333147966386144929666651337523200000000 |
[1,120,3628800,1307674368000,2432902008176640000, 15511210043330985984000000, 265252859812191058636308480000000, 10333147966386144929666651337523200000000] |