The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 4 |
| 7 | 12 |
| 8 | 16 |
| 9 | 132 |
| 10 | 308 |
| 11 | 1096 |
| 12 | 3704 |
| 13 | 12984 |
| 14 | 47008 |
| 15 | 179660 |
| 16 | 681608 |
[0,0,0,0,0,4,12,16,132,308,1096,3704,12984,47008, 179660,681608] |