The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 12 |
| 4 | 1620 |
| 5 | 148392 |
| 6 | 14979216 |
| 7 | 1978392960 |
| 8 | 370450049664 |
| 9 | 102638643985920 |
| 10 | 43175669754811392 |
[0,0,12,1620,148392,14979216,1978392960, 370450049664,102638643985920,43175669754811392] |