The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 7 |
| 3 | 45 |
| 4 | 650 |
| 5 | 24520 |
| 6 | 2625117 |
| 7 | 836488618 |
| 8 | 818230288201 |
| 9 | 2450178750246304 |
| 10 | 21127413841918751449 |
[2,7,45,650,24520,2625117,836488618,818230288201, 2450178750246304,21127413841918751449] |