The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 33 |
| 4 | 360 |
| 5 | 3816 |
| 6 | 38911 |
| 7 | 396016 |
| 8 | 4015732 |
| 9 | 40543671 |
| 10 | 408462140 |
| 11 | 4109293287 |
| 12 | 41296082801 |
| 13 | 414669334188 |
| 14 | 4161237526152 |
[1,3,33,360,3816,38911,396016,4015732,40543671, 408462140,4109293287,41296082801,414669334188, 4161237526152] |