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| n | a(n) |
|---|---|
| 0 | 15 |
| 1 | 16859 |
| 2 | 48218513 |
| 3 | 149732983675 |
| 4 | 472579187185537 |
| 5 | 1494134816265585397 |
| 6 | 4724776275561584896709 |
| 7 | 14941025134674593046033085 |
[15,16859,48218513,149732983675,472579187185537, 1494134816265585397,4724776275561584896709, 14941025134674593046033085] |