The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 19 |
| 6 | 63 |
| 7 | 153 |
| 8 | 1273 |
| 9 | 2090 |
| 10 | 19227 |
| 11 | 266133 |
| 12 | 868868 |
| 13 | 10631543 |
| 14 | 264365332 |
| 15 | 662822809 |
| 16 | 129102309125 |
[1,2,4,19,63,153,1273,2090,19227,266133,868868, 10631543,264365332,662822809,129102309125] |