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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 24 |
| 3 | 720 |
| 4 | 40320 |
| 5 | 3628800 |
| 6 | 479001600 |
| 7 | 87178291200 |
| 8 | 20922789888000 |
| 9 | 6402373705728000 |
| 10 | 2432902008176640000 |
| 11 | 1124000727777607680000 |
| 12 | 620448401733239439360000 |
| 13 | 36662860102418694144000000 |
| 14 | 304888344611713860501504000000 |
| 15 | 13960676832220582033489920000000 |
[1,2,24,720,40320,3628800,479001600,87178291200, 20922789888000,6402373705728000, 2432902008176640000,1124000727777607680000, 620448401733239439360000, 36662860102418694144000000, 304888344611713860501504000000, 13960676832220582033489920000000] |