The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 9 |
| 4 | 378 |
| 5 | 39990 |
| 6 | 6207435 |
| 7 | 649615491 |
| 8 | 61839617931 |
| 9 | 5291171373321 |
| 10 | 436429418237100 |
| 11 | 34318546032095787 |
| 12 | 2635382197485052125 |
| 13 | 197482663359487272702 |
| 14 | 14177933118661639661880 |
| 15 | 968391907322785974064260 |
[1,9,378,39990,6207435,649615491,61839617931, 5291171373321,436429418237100,34318546032095787, 2635382197485052125,197482663359487272702, 14177933118661639661880,968391907322785974064260] |