The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 3 |
| 6 | 40 |
| 7 | 480 |
| 8 | 5513 |
| 9 | 65051 |
| 10 | 800679 |
| 11 | 10384967 |
| 12 | 142357706 |
| 13 | 2064273113 |
| 14 | 31644682654 |
| 15 | 512196648751 |
[0,0,0,0,0,3,40,480,5513,65051,800679,10384967, 142357706,2064273113,31644682654,512196648751] |