The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 12 |
| 3 | 39 |
| 4 | 295 |
| 5 | 1985 |
| 6 | 15129 |
| 7 | 56978 |
| 8 | 861159 |
| 9 | 6542578 |
| 10 | 49828415 |
[1,1,12,39,295,1985,15129,56978,861159,6542578, 49828415] |