The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 11 |
| 5 | 71 |
| 6 | 268 |
| 7 | 2302 |
| 8 | 2771 |
| 9 | 29543 |
| 10 | 172654 |
| 11 | 2194624 |
| 12 | 7533469 |
| 13 | 111102841 |
| 14 | 875654984 |
| 15 | 1335478594 |
| 16 | 16332117629 |
| 17 | 307026528761 |
| 18 | 3040884758542 |
| 19 | 63303287929996 |
| 20 | 345404844856129 |
| 21 | 7886534621278669 |
| 22 | 94005382576044068 |
| 23 | 2335627560917144282 |
| 24 | 7547413632563686237 |
| 25 | 11923476834093824801 |
[1,2,8,11,71,268,2302,2771,29543,172654,2194624, 7533469,111102841,875654984,1335478594, 16332117629,307026528761,3040884758542, 63303287929996,345404844856129,7886534621278669, 94005382576044068,2335627560917144282, 7547413632563686237,11923476834093824801] |