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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 720 |
| 2 | 479001600 |
| 3 | 6402373705728000 |
| 4 | 620448401733239439360000 |
| 5 | 265252859812191058636308480000000 |
| 6 | 371993326789901217467999448150835200000000 |
| 7 | 1405006117752879898543142606244511569936384000000000 |
| 8 | 12413915592536072670862289047373375038521486354677760000000000 |
[1,720,479001600,6402373705728000, 620448401733239439360000, 265252859812191058636308480000000, 371993326789901217467999448150835200000000, 14050061177528798985431426062445115699363840000000\ 00, 12413915592536072670862289047373375038521486354677\ 760000000000] |