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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 64 |
| 4 | 1026 |
| 5 | 32832 |
| 6 | 2097152 |
| 7 | 268435456 |
| 8 | 68719348224 |
| 9 | 35184372089856 |
| 10 | 36028797018963968 |
| 11 | 73786976297388343296 |
[2,6,64,1026,32832,2097152,268435456,68719348224, 35184372089856,36028797018963968, 73786976297388343296] |