The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 27 |
| 3 | 245 |
| 4 | 2208 |
| 5 | 19872 |
| 6 | 178850 |
| 7 | 1609653 |
| 8 | 14486877 |
| 9 | 130381895 |
| 10 | 1173437058 |
| 11 | 10560933522 |
| 12 | 95048401700 |
| 13 | 855435615303 |
| 14 | 7698920537727 |
| 15 | 69290284839545 |
| 16 | 623612563555908 |
| 17 | 5612513072003172 |
[3,27,245,2208,19872,178850,1609653,14486877, 130381895,1173437058,10560933522,95048401700, 855435615303,7698920537727,69290284839545, 623612563555908,5612513072003172] |