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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 4 |
| 4 | 1198 |
| 5 | 1829388 |
| 6 | 23796035743 |
| 7 | 2142967506078650 |
| 8 | 1608943108575146892075 |
[0,0,4,1198,1829388,23796035743,2142967506078650, 1608943108575146892075] |