The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 48 |
| 3 | 480 |
| 4 | 5736 |
| 5 | 79584 |
| 6 | 1256808 |
| 7 | 22262640 |
| 8 | 437315016 |
| 9 | 9438589824 |
| 10 | 222109617288 |
| 11 | 5661445534800 |
| 12 | 155427839133096 |
| 13 | 4573268363775264 |
| 14 | 143592923776842408 |
| 15 | 4792636497324986160 |
| 16 | 169456698405536983176 |
[1,6,48,480,5736,79584,1256808,22262640,437315016, 9438589824,222109617288,5661445534800, 155427839133096,4573268363775264, 143592923776842408,4792636497324986160, 169456698405536983176] |