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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 720 |
| 7 | 5040 |
| 8 | 448 |
| 9 | 36288 |
| 10 | 3628800 |
| 11 | 39916800 |
| 12 | 479001600 |
| 13 | 6227020800 |
| 14 | 363242880 |
| 15 | 81729648000 |
| 16 | 20922789888000 |
| 17 | 355687428096000 |
| 18 | 6402373705728000 |
| 19 | 121645100408832000 |
| 20 | 5266021662720000 |
| 21 | 2322315553259520000 |
[1,2,6,24,120,720,5040,448,36288,3628800,39916800, 479001600,6227020800,363242880,81729648000, 20922789888000,355687428096000,6402373705728000, 121645100408832000,5266021662720000, 2322315553259520000] |