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| n | a(n) |
|---|---|
| 2 | 4 |
| 3 | 16 |
| 4 | 64 |
| 5 | 65536 |
| 6 | 4096 |
| 7 | 18446744073709551616 |
| 8 | 16777216 |
| 9 | 68719476736 |
| 10 | 281474976710656 |
[4,16,64,65536,4096,18446744073709551616,16777216, 68719476736,281474976710656] |