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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 184 |
| 5 | 41450 |
| 6 | 2698344 |
| 7 | 101727276 |
| 8 | 2846840080 |
| 9 | 66502921806 |
| 10 | 1382518990400 |
[0,184,41450,2698344,101727276,2846840080, 66502921806,1382518990400] |