The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 18 |
| 3 | 338 |
| 4 | 2883 |
| 5 | 24642 |
| 6 | 486098 |
| 7 | 4155987 |
| 8 | 35532450 |
| 9 | 700951682 |
| 10 | 5992929075 |
| 11 | 51237766962 |
[3,18,338,2883,24642,486098,4155987,35532450, 700951682,5992929075,51237766962] |