The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 34 |
| 4 | 158 |
| 5 | 734 |
| 6 | 3522 |
| 7 | 16931 |
| 8 | 82554 |
| 9 | 403038 |
| 10 | 1981441 |
| 11 | 9752204 |
| 12 | 48182790 |
| 13 | 238274637 |
| 14 | 1180966793 |
| 15 | 5857505302 |
| 16 | 29093385069 |
| 17 | 144585962175 |
| 18 | 719208130384 |
| 19 | 3579154241329 |
| 20 | 17822841278776 |
| 21 | 88782972903383 |
| 22 | 442460346577831 |
| 23 | 2205683206949191 |
| 24 | 10998978955143953 |
| 25 | 54860627855107552 |
| 26 | 273700020776978268 |
[1,2,8,34,158,734,3522,16931,82554,403038,1981441, 9752204,48182790,238274637,1180966793,5857505302, 29093385069,144585962175,719208130384, 3579154241329,17822841278776,88782972903383, 442460346577831,2205683206949191, 10998978955143953,54860627855107552, 273700020776978268] |