The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 9 |
| 3 | 43 |
| 4 | 241 |
| 5 | 1397 |
| 6 | 7989 |
| 7 | 45956 |
| 8 | 264378 |
| 9 | 1520571 |
| 10 | 8746983 |
| 11 | 50315631 |
| 12 | 289432219 |
| 13 | 1664916443 |
| 14 | 9577180972 |
| 15 | 55091295173 |
| 16 | 316904423483 |
| 17 | 1822945187570 |
[1,9,43,241,1397,7989,45956,264378,1520571, 8746983,50315631,289432219,1664916443,9577180972, 55091295173,316904423483,1822945187570] |