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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 58 |
| 4 | 802 |
| 5 | 20834 |
| 6 | 1051586 |
| 7 | 102233986 |
| 8 | 19614424834 |
| 9 | 7355623374338 |
[1,2,8,58,802,20834,1051586,102233986,19614424834, 7355623374338] |