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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 56 |
| 4 | 3360 |
| 5 | 833280 |
| 6 | 959938560 |
| 7 | 3901190307840 |
| 8 | 63667425823948800 |
| 9 | 4759267415191820697600 |
| 10 | 1246395024829755538853068800 |
[1,3,56,3360,833280,959938560,3901190307840, 63667425823948800,4759267415191820697600, 1246395024829755538853068800] |