The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 30 |
| 4 | 102 |
| 5 | 324 |
| 6 | 1029 |
| 7 | 3096 |
| 8 | 9960 |
| 9 | 30732 |
| 10 | 97932 |
| 11 | 295924 |
| 12 | 929202 |
| 13 | 2766958 |
| 14 | 8590731 |
| 15 | 25271897 |
| 16 | 77575820 |
[1,3,9,30,102,324,1029,3096,9960,30732,97932, 295924,929202,2766958,8590731,25271897,77575820] |