The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 10 |
| 5 | 290 |
| 6 | 272890 |
| 7 | 264588959090 |
| 8 | 268440386798659418988490 |
| 9 | 295105036840595214385430531020664149472669868290 |
| 10 | 377908709746050392481071609609580527436122569261424131112048023467330784739529329885668846964890 |
[1,1,2,10,290,272890,264588959090, 268440386798659418988490, 295105036840595214385430531020664149472669868290, 37790870974605039248107160960958052743612256926142\ 4131112048023467330784739529329885668846964890] |