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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 10 |
| 3 | 87 |
| 4 | 834 |
| 5 | 7992 |
| 6 | 77696 |
| 7 | 758582 |
| 8 | 7436825 |
| 9 | 73129588 |
| 10 | 720726912 |
[0,1,10,87,834,7992,77696,758582,7436825,73129588, 720726912] |