The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 41 |
| 3 | 171 |
| 4 | 694 |
| 5 | 2790 |
| 6 | 11172 |
| 7 | 44702 |
| 8 | 178825 |
| 9 | 715319 |
| 10 | 2861297 |
| 11 | 11445210 |
| 12 | 45780865 |
| 13 | 183123485 |
| 14 | 301029988 |
| 15 | 301029988 |
[9,41,171,694,2790,11172,44702,178825,715319, 2861297,11445210,45780865,183123485,301029988, 301029988] |