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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 11 |
| 3 | 89 |
| 4 | 1063 |
| 5 | 17099 |
| 6 | 352700 |
| 7 | 8987170 |
| 8 | 275303298 |
| 9 | 9930027149 |
| 10 | 414883314611 |
[1,2,11,89,1063,17099,352700,8987170,275303298, 9930027149,414883314611] |