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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 7 |
| 3 | 125 |
| 4 | 9540 |
| 5 | 1820908 |
| 6 | 1000914270 |
| 7 | 1545539179382 |
| 8 | 6744089252983902 |
| 9 | 83045349878880145528 |
[0,7,125,9540,1820908,1000914270,1545539179382, 6744089252983902,83045349878880145528] |