The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 10 | 3628800 |
| 11 | 199584000 |
| 12 | 6187104000 |
| 13 | 142702560000 |
| 14 | 2731586457600 |
| 15 | 45950224320000 |
| 16 | 703098107712000 |
| 17 | 10009442963520000 |
| 18 | 134672620008326400 |
| 19 | 1732015476199008000 |
| 20 | 21473732319740064000 |
| 21 | 258323865658578720000 |
[3628800,199584000,6187104000,142702560000, 2731586457600,45950224320000,703098107712000, 10009442963520000,134672620008326400, 1732015476199008000,21473732319740064000, 258323865658578720000] |