The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 16 |
| 4 | 32 |
| 5 | 220 |
| 6 | 872 |
| 7 | 5886 |
| 8 | 35346 |
| 9 | 242546 |
| 10 | 1605278 |
| 11 | 10937906 |
| 12 | 74343368 |
| 13 | 513111965 |
| 14 | 3568652234 |
| 15 | 25077325748 |
| 16 | 177535832330 |
[2,16,32,220,872,5886,35346,242546,1605278, 10937906,74343368,513111965,3568652234, 25077325748,177535832330] |