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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 4 |
| 3 | 113 |
| 4 | 5663 |
| 5 | 766094 |
| 6 | 281251424 |
| 7 | 260938102438 |
| 8 | 624662873923282 |
| 9 | 3865535525302817693 |
[0,4,113,5663,766094,281251424,260938102438, 624662873923282,3865535525302817693] |