| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 43 |
| 8 | 617 |
| 9 | 7681 |
| 10 | 79756 |
| 11 | 741665 |
| 12 | 6467891 |
| 13 | 54658254 |
| 14 | 451897330 |
| 15 | 3685879069 |
| 16 | 30091146181 |
| 17 | 248749105815 |
| 18 | 2091117462980 |
| 19 | 17933165800591 |
| 20 | 157654535847037 |
| 21 | 1426401197217090 |
| 22 | 13303368764700743 |
| 23 | 127934361462621048 |
| 24 | 1268098183967052868 |
| 25 | 12948542410221048226 |
[1,43,617,7681,79756,741665,6467891,54658254, 451897330,3685879069,30091146181,248749105815, 2091117462980,17933165800591,157654535847037, 1426401197217090,13303368764700743, 127934361462621048,1268098183967052868, 12948542410221048226] |