The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 27 |
| 4 | 93 |
| 5 | 351 |
| 6 | 1377 |
| 7 | 5427 |
| 8 | 21357 |
| 9 | 84159 |
| 10 | 333153 |
| 11 | 1326051 |
| 12 | 5303421 |
| 13 | 21289311 |
| 14 | 85705857 |
| 15 | 345845619 |
| 16 | 1398456333 |
| 17 | 5665268223 |
| 18 | 22988910753 |
| 19 | 93426350211 |
| 20 | 380195618589 |
| 21 | 1549080017055 |
| 22 | 6318592156737 |
| 23 | 25799086012563 |
| 24 | 105436076580909 |
| 25 | 431263713923775 |
| 26 | 1765374618535137 |
[1,3,9,27,93,351,1377,5427,21357,84159,333153, 1326051,5303421,21289311,85705857,345845619, 1398456333,5665268223,22988910753,93426350211, 380195618589,1549080017055,6318592156737, 25799086012563,105436076580909,431263713923775, 1765374618535137] |