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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 10 |
| 3 | 90 |
| 4 | 898 |
| 5 | 7200 |
| 6 | 60732 |
| 7 | 506724 |
| 8 | 4320516 |
| 9 | 37171762 |
| 10 | 323469590 |
[0,10,90,898,7200,60732,506724,4320516,37171762, 323469590] |