The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 8 |
| 3 | 126 |
| 4 | 2586 |
| 5 | 52189 |
| 6 | 1071230 |
| 7 | 21914482 |
| 8 | 449023031 |
| 9 | 9196824619 |
| 10 | 188399767218 |
| 11 | 3859260231149 |
| 12 | 79056143231850 |
| 13 | 1619440886287615 |
| 14 | 33173815285042631 |
| 15 | 679556410727542259 |
| 16 | 13920527633029367143 |
| 17 | 285158193122827850868 |
[1,8,126,2586,52189,1071230,21914482,449023031, 9196824619,188399767218,3859260231149, 79056143231850,1619440886287615,33173815285042631, 679556410727542259,13920527633029367143, 285158193122827850868] |