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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 7 |
| 2 | 84 |
| 3 | 1072 |
| 4 | 73383 |
| 5 | 11347520 |
| 6 | 3274136129 |
| 7 | 2837230608103 |
| 8 | 5852047214414019 |
[1,7,84,1072,73383,11347520,3274136129, 2837230608103,5852047214414019] |