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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 113 |
| 4 | 5663 |
| 5 | 755110 |
| 6 | 268494008 |
| 7 | 242019919082 |
| 8 | 559205410771472 |
| 9 | 3316464212029290964 |
[0,4,113,5663,755110,268494008,242019919082, 559205410771472,3316464212029290964] |