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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 13 |
| 2 | 441 |
| 3 | 20629 |
| 4 | 1119361 |
| 5 | 66116013 |
| 6 | 4126228569 |
| 7 | 267666251733 |
| 8 | 17868312820737 |
| 9 | 1219477111897933 |
| 10 | 84701899713767161 |
| 11 | 5967906378862013973 |
| 12 | 425503428034568158081 |
| 13 | 30642774518964618986989 |
| 14 | 2225692868157573335052441 |
| 15 | 162858794856607965831417429 |
| 16 | 11993850186156155815298686977 |
[1,13,441,20629,1119361,66116013,4126228569, 267666251733,17868312820737,1219477111897933, 84701899713767161,5967906378862013973, 425503428034568158081,30642774518964618986989, 2225692868157573335052441, 162858794856607965831417429, 11993850186156155815298686977] |