The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 9 |
| 3 | 217 |
| 4 | 9521 |
| 5 | 634321 |
| 6 | 58026745 |
| 7 | 6846238057 |
| 8 | 998806698209 |
| 9 | 174849870369313 |
| 10 | 35915074166268521 |
| 11 | 8507730512772340345 |
| 12 | 2292605150744212481809 |
| 13 | 695028316821630097748209 |
| 14 | 234883073320203308189545049 |
| 15 | 87808334177056337272289692681 |
| 16 | 36075481332626610937457504918465 |
[1,1,9,217,9521,634321,58026745,6846238057, 998806698209,174849870369313,35915074166268521, 8507730512772340345,2292605150744212481809, 695028316821630097748209, 234883073320203308189545049, 87808334177056337272289692681, 36075481332626610937457504918465] |