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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 24 |
| 5 | 120 |
| 6 | 720 |
| 7 | 5040 |
| 8 | 37824 |
| 9 | 314400 |
| 10 | 2844000 |
| 11 | 28423984 |
| 12 | 311846784 |
| 13 | 3572644116 |
| 14 | 45215788176 |
| 15 | 607346654710 |
| 16 | 8780711006712 |
[1,2,6,24,120,720,5040,37824,314400,2844000, 28423984,311846784,3572644116,45215788176, 607346654710,8780711006712] |