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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 2 |
| 2 | 4 |
| 3 | 32 |
| 4 | 4096 |
| 5 | 134217728 |
| 6 | 288230376151711744 |
| 7 | 2658455991569831745807614120560689152 |
| 8 | 452312848583266388373324160190187140051835877600158453279131187530910662656 |
[2,2,4,32,4096,134217728,288230376151711744, 2658455991569831745807614120560689152, 45231284858326638837332416019018714005183587760015\ 8453279131187530910662656] |