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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 16 |
| 3 | 104 |
| 4 | 751 |
| 5 | 5789 |
| 6 | 46656 |
| 7 | 388377 |
| 8 | 3313304 |
| 9 | 28816513 |
| 10 | 254548840 |
| 11 | 2277498340 |
| 12 | 20596833817 |
| 13 | 187974816142 |
| 14 | 1729033498416 |
| 15 | 16012809644088 |
| 16 | 149186508912927 |
| 17 | 1397300099214753 |
| 18 | 13149137686976324 |
| 19 | 124262625068365924 |
| 20 | 1178796712807563025 |
[1,3,16,104,751,5789,46656,388377,3313304, 28816513,254548840,2277498340,20596833817, 187974816142,1729033498416,16012809644088, 149186508912927,1397300099214753, 13149137686976324,124262625068365924, 1178796712807563025] |