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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 64 |
| 3 | 17576 |
| 4 | 40960000 |
| 5 | 829997587232 |
| 6 | 148863517207035904 |
| 7 | 238534446168822298080896 |
| 8 | 3429499272008000182681600000000 |
| 9 | 443223773846454955204927262062339154432 |
[2,64,17576,40960000,829997587232, 148863517207035904,238534446168822298080896, 3429499272008000182681600000000, 443223773846454955204927262062339154432] |