The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 65 |
| 4 | 645 |
| 5 | 8141 |
| 6 | 124729 |
| 7 | 2247853 |
| 8 | 46584937 |
| 9 | 1091386465 |
| 10 | 28521016621 |
| 11 | 822514469149 |
| 12 | 25946988879053 |
| 13 | 888784357214729 |
| 14 | 32851731018695905 |
| 15 | 1303291334592451037 |
| 16 | 55235983848811714129 |
| 17 | 2490726416399046168993 |
| 18 | 119065442891277782378581 |
| 19 | 6014589653389306889686941 |
[1,2,9,65,645,8141,124729,2247853,46584937, 1091386465,28521016621,822514469149, 25946988879053,888784357214729,32851731018695905, 1303291334592451037,55235983848811714129, 2490726416399046168993,119065442891277782378581, 6014589653389306889686941] |