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| n | a(n) |
|---|---|
| 1 | 181 |
| 2 | 3701360 |
| 3 | 26231137608 |
| 4 | 247462638659680 |
| 5 | 2112817100467905536 |
[181,3701360,26231137608,247462638659680, 2112817100467905536] |