The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 6 |
| 4 | 840 |
| 5 | 120 |
| 6 | 332640 |
| 7 | 5040 |
| 8 | 259459200 |
| 9 | 362880 |
| 10 | 335221286400 |
| 11 | 39916800 |
| 12 | 647647525324800 |
| 13 | 6227020800 |
| 14 | 1748648318376960000 |
| 15 | 1307674368000 |
| 16 | 6288139352883548160000 |
| 17 | 355687428096000 |
| 18 | 29051203810321992499200000 |
[1,6,6,840,120,332640,5040,259459200,362880, 335221286400,39916800,647647525324800,6227020800, 1748648318376960000,1307674368000, 6288139352883548160000,355687428096000, 29051203810321992499200000] |