The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 53 |
| 5 | 179 |
| 6 | 983 |
| 7 | 2561 |
| 8 | 14941 |
| 9 | 102269 |
| 10 | 1213033 |
| 11 | 5995117 |
| 12 | 42509945 |
| 13 | 331637747 |
| 14 | 8089546229 |
| 15 | 32698035787 |
[1,3,13,53,179,983,2561,14941,102269,1213033, 5995117,42509945,331637747,8089546229,32698035787] |