The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 24 |
| 4 | 48 |
| 5 | 5760 |
| 6 | 11520 |
| 7 | 2903040 |
| 8 | 5806080 |
| 9 | 1393459200 |
| 10 | 2786918400 |
| 11 | 367873228800 |
| 12 | 735746457600 |
| 13 | 24103053950976000 |
| 14 | 48206107901952000 |
| 15 | 578473294823424000 |
| 16 | 1156946589646848000 |
| 17 | 9440684171518279680000 |
| 18 | 18881368343036559360000 |
| 19 | 271211974879377138647040000 |
[1,2,24,48,5760,11520,2903040,5806080,1393459200, 2786918400,367873228800,735746457600, 24103053950976000,48206107901952000, 578473294823424000,1156946589646848000, 9440684171518279680000,18881368343036559360000, 271211974879377138647040000] |