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 | 1 |
| 9 | 0 |
| 10 | 1 |
| 11 | 1 |
| 12 | 5 |
| 13 | 4 |
| 14 | 14 |
| 15 | 17 |
| 16 | 72 |
| 17 | 121 |
| 18 | 474 |
| 19 | 1376 |
[0,0,0,0,0,0,0,1,0,1,1,5,4,14,17,72,121,474,1376] |