The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 29 |
| 5 | 140 |
| 6 | 758 |
| 7 | 4448 |
| 8 | 27782 |
| 9 | 182322 |
| 10 | 1245399 |
| 11 | 8793649 |
| 12 | 63844600 |
| 13 | 474662243 |
| 14 | 3601895485 |
| 15 | 27823860424 |
| 16 | 218325937188 |
| 17 | 1737070192604 |
[1,2,7,29,140,758,4448,27782,182322,1245399, 8793649,63844600,474662243,3601895485,27823860424, 218325937188,1737070192604] |