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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 57 |
| 4 | 775 |
| 5 | 19641 |
| 6 | 921690 |
| 7 | 80625050 |
| 8 | 13124722225 |
| 9 | 3973078785189 |
| 10 | 2237747461311054 |
| 11 | 2344793549245488048 |
| 12 | 4570701601942028573011 |
| 13 | 16575255948705837833863791 |
| 14 | 111824026459437969673639006613 |
[1,2,8,57,775,19641,921690,80625050,13124722225, 3973078785189,2237747461311054, 2344793549245488048,4570701601942028573011, 16575255948705837833863791, 111824026459437969673639006613] |