The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 24 |
| 4 | 24 |
| 5 | 86 |
| 6 | 1260 |
| 7 | 1890 |
| 8 | 14136 |
| 9 | 197400 |
| 10 | 10467660 |
| 11 | 1231572090 |
[1,8,24,24,86,1260,1890,14136,197400,10467660, 1231572090] |