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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 720 |
| 3 | 362880 |
| 4 | 479001600 |
| 5 | 1307674368000 |
| 6 | 6402373705728000 |
| 7 | 51090942171709440000 |
| 8 | 620448401733239439360000 |
| 9 | 10888869450418352160768000000 |
| 10 | 265252859812191058636308480000000 |
[1,6,720,362880,479001600,1307674368000, 6402373705728000,51090942171709440000, 620448401733239439360000, 10888869450418352160768000000, 265252859812191058636308480000000] |