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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 12 |
| 4 | 163 |
| 5 | 57800 |
| 6 | 6910401969 |
| 7 | 69047272940549306735 |
| 8 | 9431570193753590001558014495854550084583 |
[1,2,12,163,57800,6910401969,69047272940549306735, 9431570193753590001558014495854550084583] |