The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 24 |
| 4 | 630 |
| 5 | 52800 |
| 6 | 11381760 |
| 7 | 6738443712 |
| 8 | 10487895163200 |
| 9 | 43294107630090240 |
| 10 | 469590163875486482400 |
| 11 | 13388418681612808458240000 |
| 12 | 1001088091286168023193223168000 |
| 13 | 196239953628635168336022309340569600 |
[1,2,24,630,52800,11381760,6738443712, 10487895163200,43294107630090240, 469590163875486482400,13388418681612808458240000, 1001088091286168023193223168000, 196239953628635168336022309340569600] |