The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 72 |
| 4 | 10794 |
| 5 | 4396148 |
| 6 | 5372968836 |
| 7 | 19590379147806 |
| 8 | 206003718526985328 |
| 9 | 6097257359554668961413 |
[0,1,72,10794,4396148,5372968836,19590379147806, 206003718526985328,6097257359554668961413] |