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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 4 |
| 4 | 208 |
| 5 | 6582 |
| 6 | 1249354 |
| 7 | 262048125 |
| 8 | 288902941734 |
| 9 | 350421368609396 |
[1,0,4,208,6582,1249354,262048125,288902941734, 350421368609396] |