The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 156 |
| 4 | 1696 |
| 5 | 3974 |
| 6 | 21558 |
| 7 | 82512 |
| 8 | 631294 |
| 9 | 5619414 |
| 10 | 93118405 |
| 11 | 739310894 |
[1,9,156,1696,3974,21558,82512,631294,5619414, 93118405,739310894] |