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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 20 |
| 4 | 229 |
| 5 | 3764 |
| 6 | 80383 |
| 7 | 2107412 |
| 8 | 65436033 |
| 9 | 2347211812 |
| 10 | 95492023811 |
| 11 | 4344109422388 |
| 12 | 218499395486909 |
| 13 | 12039757564700644 |
| 14 | 721239945304498215 |
| 15 | 46669064731537444820 |
| 16 | 3243864647191662324601 |
| 17 | 241046155271316751794596 |
[1,3,20,229,3764,80383,2107412,65436033, 2347211812,95492023811,4344109422388, 218499395486909,12039757564700644, 721239945304498215,46669064731537444820, 3243864647191662324601,241046155271316751794596] |