The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 2 | 3 |
| 3 | 6 |
| 4 | 24 |
| 5 | 189 |
| 6 | 1050 |
| 7 | 5130 |
| 8 | 29586 |
| 9 | 183822 |
| 10 | 1132146 |
| 11 | 7238454 |
| 12 | 48779613 |
| 13 | 335824479 |
| 14 | 2318832510 |
| 15 | 15998104497 |
| 16 | 110190456270 |
[3,6,24,189,1050,5130,29586,183822,1132146, 7238454,48779613,335824479,2318832510,15998104497, 110190456270] |