The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 19 |
| 4 | 197 |
| 5 | 2801 |
| 6 | 50407 |
| 7 | 1098371 |
| 8 | 28122761 |
| 9 | 827684785 |
| 10 | 27534518411 |
| 11 | 1021777860995 |
| 12 | 41847737874637 |
| 13 | 1875044409274817 |
| 14 | 91239372967844207 |
| 15 | 4791502346638758931 |
| 16 | 270114113377777911569 |
| 17 | 16269795487513345957025 |
| 18 | 1042794341136010753491475 |
[1,1,3,19,197,2801,50407,1098371,28122761, 827684785,27534518411,1021777860995, 41847737874637,1875044409274817,91239372967844207, 4791502346638758931,270114113377777911569, 16269795487513345957025,1042794341136010753491475] |