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| n | a(n) |
|---|---|
| 3 | 3 |
| 4 | 10 |
| 5 | 22 |
| 6 | 3632 |
| 7 | 208832 |
| 8 | 2951663232 |
| 9 | 495544395797176320 |
| 10 | 200574509261253351243776 |
[3,10,22,3632,208832,2951663232, 495544395797176320,200574509261253351243776] |