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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 37 |
| 8 | 893 |
| 9 | 18154 |
| 10 | 340937 |
| 11 | 6180603 |
| 12 | 110766150 |
| 13 | 1990357262 |
| 14 | 36180430112 |
| 15 | 669322808727 |
[1,37,893,18154,340937,6180603,110766150, 1990357262,36180430112,669322808727] |