The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 7 |
| 6 | 25 |
| 7 | 55 |
| 8 | 187 |
| 9 | 1099 |
| 10 | 9278 |
| 11 | 75511 |
| 12 | 645474 |
| 13 | 7422000 |
| 14 | 116915443 |
| 15 | 2299714950 |
| 16 | 51760679784 |
| 17 | 1407030104754 |
[1,7,25,55,187,1099,9278,75511,645474,7422000, 116915443,2299714950,51760679784,1407030104754] |