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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 728 |
| 3 | 2010400 |
| 4 | 149722274204 |
| 5 | 336506531388308154 |
| 6 | 24971865691721319776338222 |
[7,728,2010400,149722274204,336506531388308154, 24971865691721319776338222] |