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| n | a(n) |
|---|---|
| 1 | 13 |
| 2 | 289 |
| 3 | 6277 |
| 4 | 134440 |
| 5 | 2876170 |
| 6 | 61534448 |
| 7 | 1316714732 |
| 8 | 28177227352 |
| 9 | 602998827928 |
| 10 | 12904414518912 |
| 11 | 276160275058160 |
| 12 | 5909958226524512 |
| 13 | 126475877308730464 |
| 14 | 2706643227463513344 |
| 15 | 57923438257867988416 |
| 16 | 1239588830689830585216 |
[13,289,6277,134440,2876170,61534448,1316714732, 28177227352,602998827928,12904414518912, 276160275058160,5909958226524512, 126475877308730464,2706643227463513344, 57923438257867988416,1239588830689830585216] |