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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 9 |
| 3 | 46 |
| 4 | 503 |
| 5 | 6252 |
| 6 | 84201 |
| 7 | 1105270 |
| 8 | 14040589 |
| 9 | 172462528 |
| 10 | 2059008115 |
[0,9,46,503,6252,84201,1105270,14040589,172462528, 2059008115] |