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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 16 |
| 3 | 170 |
| 4 | 2416 |
| 5 | 42962 |
| 6 | 916696 |
| 7 | 22819610 |
| 8 | 649207456 |
| 9 | 20778364322 |
| 10 | 738918769576 |
| 11 | 28905116527850 |
| 12 | 1233506128752496 |
| 13 | 57025618592932082 |
| 14 | 2839117599033828856 |
| 15 | 151446758367400488890 |
| 16 | 8617182795217834505536 |
| 17 | 520954229292164353554242 |
[1,2,16,170,2416,42962,916696,22819610,649207456, 20778364322,738918769576,28905116527850, 1233506128752496,57025618592932082, 2839117599033828856,151446758367400488890, 8617182795217834505536,520954229292164353554242] |