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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 720 |
| 7 | 5040 |
| 8 | 40320 |
| 9 | 362880 |
| 10 | 3386880 |
| 11 | 33782400 |
| 12 | 359318016 |
| 13 | 4161620928 |
| 14 | 51466442688 |
| 15 | 681421241696 |
| 16 | 9464247206208 |
[1,2,6,24,120,720,5040,40320,362880,3386880, 33782400,359318016,4161620928,51466442688, 681421241696,9464247206208] |