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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 81 |
| 3 | 28672 |
| 4 | 791015625 |
| 5 | 191221621088256 |
| 6 | 7860041410116536427241 |
| 7 | 2836619246897071128576000000000 |
| 8 | 304913968803300753908857213381006097576481 |
[2,81,28672,791015625,191221621088256, 7860041410116536427241, 2836619246897071128576000000000, 304913968803300753908857213381006097576481] |