The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 9 |
| 2 | 0 |
| 3 | 240 |
| 4 | 1380 |
| 5 | 4578 |
| 6 | 10794 |
| 7 | 19494 |
| 8 | 27912 |
| 9 | 32195 |
| 10 | 30085 |
| 11 | 22748 |
| 12 | 13820 |
| 13 | 6656 |
| 14 | 2486 |
| 15 | 695 |
| 16 | 137 |
| 17 | 17 |
| 18 | 1 |
[9,0,240,1380,4578,10794,19494,27912,32195,30085, 22748,13820,6656,2486,695,137,17,1] |