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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 2 |
| 5 | 127 |
| 6 | 16610 |
| 7 | 5724089 |
| 8 | 5560851506 |
| 9 | 15994688084064 |
| 10 | 141829598147941814 |
[0,0,0,2,127,16610,5724089,5560851506, 15994688084064,141829598147941814] |