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| n | a(n) |
|---|---|
| 4 | 4 |
| 5 | 7 |
| 6 | 78 |
| 7 | 660 |
| 8 | 19896 |
| 9 | 352350 |
| 10 | 29182380 |
| 11 | 1150637340 |
| 12 | 215977376730 |
[4,7,78,660,19896,352350,29182380,1150637340, 215977376730] |