The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 4 |
| 5 | 20 |
| 6 | 60 |
| 7 | 420 |
| 8 | 3360 |
| 9 | 20160 |
| 10 | 201600 |
| 11 | 2217600 |
| 12 | 19958400 |
| 13 | 259459200 |
| 14 | 3632428800 |
| 15 | 43589145600 |
| 16 | 697426329600 |
| 17 | 11856247603200 |
| 18 | 177843714048000 |
| 19 | 3379030566912000 |
| 20 | 67580611338240000 |
| 21 | 1216451004088320000 |
| 22 | 26761922089943040000 |
| 23 | 615524208068689920000 |
[1,4,20,60,420,3360,20160,201600,2217600,19958400, 259459200,3632428800,43589145600,697426329600, 11856247603200,177843714048000,3379030566912000, 67580611338240000,1216451004088320000, 26761922089943040000,615524208068689920000] |