The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 141 |
| 3 | 95635680 |
| 4 | 1557850709802421 |
| 5 | 338059904123009135280850 |
| 6 | 640278723754096114457315005223400 |
| 7 | 7745310191767932461627415566004172302489000 |
[0,141,95635680,1557850709802421, 338059904123009135280850, 640278723754096114457315005223400, 7745310191767932461627415566004172302489000] |