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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 69 |
| 4 | 769 |
| 5 | 11346 |
| 6 | 208914 |
| 7 | 4613976 |
| 8 | 118840164 |
| 9 | 3496297632 |
| 10 | 115638728395 |
| 11 | 4246267163601 |
| 12 | 171369282105510 |
| 13 | 7538270885559264 |
| 14 | 358926669220446804 |
| 15 | 18389706733665138450 |
| 16 | 1008742283718489346668 |
| 17 | 58981158542987625464424 |
[1,2,9,69,769,11346,208914,4613976,118840164, 3496297632,115638728395,4246267163601, 171369282105510,7538270885559264, 358926669220446804,18389706733665138450, 1008742283718489346668,58981158542987625464424] |