The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 12 |
| 4 | 12720 |
| 5 | 19440 |
| 6 | 5516280 |
| 7 | 5516280 |
| 8 | 7321991040 |
| 9 | 363500177040 |
| 10 | 2394196081200 |
| 11 | 3163427380990800 |
| 12 | 22755817971366480 |
| 13 | 3788978012188649280 |
| 14 | 2918756139031688155200 |
[1,2,12,12720,19440,5516280,5516280,7321991040, 363500177040,2394196081200,3163427380990800, 22755817971366480,3788978012188649280, 2918756139031688155200] |