| n | a(n) |
|---|---|
| 4 | 6 |
| 5 | 24 |
| 6 | 120 |
| 7 | 720 |
| 8 | 5040 |
| 9 | 1260 |
| 10 | 40320 |
| 11 | 18144 |
| 12 | 362880 |
| 13 | 223776 |
| 14 | 3628800 |
| 15 | 2756160 |
| 16 | 39916800 |
| 17 | 35307360 |
| 18 | 1247400 |
| 19 | 479001600 |
| 20 | 476910720 |
| 21 | 38918880 |
| 22 | 6227020800 |
| 23 | 6822541440 |
| 24 | 889945056 |
| 25 | 87178291200 |
| 26 | 103440879360 |
| 27 | 18478684224 |
[6,24,120,720,5040,1260,40320,18144,362880,223776, 3628800,2756160,39916800,35307360,1247400, 479001600,476910720,38918880,6227020800, 6822541440,889945056,87178291200,103440879360, 18478684224] |