The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 44 |
| 3 | 28681 |
| 4 | 122975608 |
| 5 | 2217051589200 |
| 6 | 127676780106968400 |
| 7 | 19483897303054057473600 |
| 8 | 6882009860546294146142870400 |
| 9 | 5078640963785630003833500263433600 |
[1,44,28681,122975608,2217051589200, 127676780106968400,19483897303054057473600, 6882009860546294146142870400, 5078640963785630003833500263433600] |