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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 13 |
| 3 | 277 |
| 4 | 6073 |
| 5 | 133321 |
| 6 | 2926981 |
| 7 | 64260253 |
| 8 | 1410798577 |
| 9 | 30973308433 |
| 10 | 680001986941 |
| 11 | 14929070404261 |
| 12 | 327759546906793 |
| 13 | 7195780961545177 |
| 14 | 157979421607087093 |
| 15 | 3468351494394370861 |
| 16 | 76145753455069071841 |
[1,13,277,6073,133321,2926981,64260253,1410798577, 30973308433,680001986941,14929070404261, 327759546906793,7195780961545177, 157979421607087093,3468351494394370861, 76145753455069071841] |