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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 7 |
| 3 | 91 |
| 4 | 4811 |
| 5 | 659721 |
| 6 | 205048072 |
| 7 | 185409601420 |
| 8 | 451074475284615 |
| 9 | 2822674184876891727 |
[0,7,91,4811,659721,205048072,185409601420, 451074475284615,2822674184876891727] |