The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 5 |
| 2 | 12 |
| 3 | 55 |
| 4 | 308 |
| 5 | 510 |
| 6 | 2340 |
| 7 | 7286 |
| 8 | 9670 |
| 9 | 125406 |
| 10 | 222961 |
| 11 | 847169 |
| 12 | 639226 |
| 13 | 6250771 |
| 14 | 14929721 |
[5,12,55,308,510,2340,7286,9670,125406,222961, 847169,639226,6250771,14929721] |