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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 64 |
| 4 | 1013 |
| 5 | 22819 |
| 6 | 1080723 |
| 7 | 98064835 |
| 8 | 16728055591 |
| 9 | 5280106993017 |
| 10 | 3064935209805679 |
[1,2,8,64,1013,22819,1080723,98064835,16728055591, 5280106993017,3064935209805679] |