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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 30 |
| 4 | 2408 |
| 5 | 1477440 |
| 6 | 854084640 |
| 7 | 1480836132576 |
| 8 | 2354482052331648 |
[1,0,30,2408,1477440,854084640,1480836132576, 2354482052331648] |