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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 0 |
| 4 | 83 |
| 5 | 1893 |
| 6 | 32834 |
| 7 | 10823065 |
| 8 | 4673855921 |
| 9 | 3376311711594 |
[0,4,0,83,1893,32834,10823065,4673855921, 3376311711594] |