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| n | a(n) |
|---|---|
| 2 | 13 |
| 3 | 360 |
| 4 | 45585 |
| 5 | 3239860 |
| 6 | 182659489 |
| 7 | 8713467416 |
| 8 | 397609974217 |
[13,360,45585,3239860,182659489,8713467416, 397609974217] |