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 | 0 |
| 12 | 0 |
| 13 | 0 |
| 14 | 0 |
| 15 | 1 |
| 16 | 0 |
| 17 | 1 |
| 18 | 2 |
| 19 | 6 |
| 20 | 40 |
| 21 | 307 |
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,1,2,6,40,307] |