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 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 0 |
| 11 | 1 |
| 12 | 6 |
| 13 | 17 |
| 14 | 55 |
| 15 | 117 |
| 16 | 226 |
| 17 | 343 |
| 18 | 535 |
[0,0,0,0,0,0,0,0,0,0,1,6,17,55,117,226,343,535] |