The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 6 |
| 5 | 36 |
| 6 | 288 |
| 7 | 3360 |
| 8 | 55440 |
| 9 | 1241856 |
| 10 | 36427776 |
| 11 | 1358235648 |
| 12 | 62818398720 |
| 13 | 3531789972480 |
| 14 | 237336286150656 |
| 15 | 18792718657929216 |
| 16 | 1732062236305809408 |
| 17 | 183865068161693614080 |
| 18 | 22273939685873740677120 |
[1,2,3,6,36,288,3360,55440,1241856,36427776, 1358235648,62818398720,3531789972480, 237336286150656,18792718657929216, 1732062236305809408,183865068161693614080, 22273939685873740677120] |