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| n | a(n) |
|---|---|
| 1 | 10 |
| 2 | 90 |
| 3 | 778 |
| 4 | 6604 |
| 5 | 55540 |
| 6 | 464782 |
| 7 | 3879760 |
| 8 | 32334096 |
| 9 | 269266622 |
| 10 | 2241467296 |
| 11 | 18655194942 |
[10,90,778,6604,55540,464782,3879760,32334096, 269266622,2241467296,18655194942] |