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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 13 |
| 4 | 162 |
| 5 | 3093 |
| 6 | 80540 |
| 7 | 2669415 |
| 8 | 107660354 |
| 9 | 5120654779 |
| 10 | 280715282502 |
| 11 | 17430145081600 |
| 12 | 1209171149737470 |
| 13 | 92693370560208210 |
| 14 | 7781500380680157240 |
| 15 | 710001855526865191083 |
| 16 | 69962579484461463387330 |
[1,2,13,162,3093,80540,2669415,107660354, 5120654779,280715282502,17430145081600, 1209171149737470,92693370560208210, 7781500380680157240,710001855526865191083, 69962579484461463387330] |