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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 7 |
| 3 | 62 |
| 4 | 2373 |
| 5 | 107723 |
| 6 | 11067544 |
| 7 | 2256313057 |
| 8 | 816589152784 |
| 9 | 612719659755750 |
[0,7,62,2373,107723,11067544,2256313057, 816589152784,612719659755750] |