The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 12 |
| 5 | 120 |
| 6 | 60 |
| 7 | 5040 |
| 8 | 1680 |
| 9 | 60480 |
| 10 | 15120 |
| 11 | 39916800 |
| 12 | 55440 |
| 13 | 6227020800 |
| 14 | 8648640 |
| 15 | 1816214400 |
| 16 | 518918400 |
| 17 | 355687428096000 |
| 18 | 147026880 |
| 19 | 121645100408832000 |
| 20 | 55870214400 |
| 21 | 1689515283456000 |
| 22 | 14079294028800 |
| 23 | 25852016738884976640000 |
| 24 | 771008958720 |
[1,2,6,12,120,60,5040,1680,60480,15120,39916800, 55440,6227020800,8648640,1816214400,518918400, 355687428096000,147026880,121645100408832000, 55870214400,1689515283456000,14079294028800, 25852016738884976640000,771008958720] |