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 | 2 |
| 10 | 10 |
| 11 | 38 |
| 12 | 127 |
| 13 | 408 |
| 14 | 1375 |
| 15 | 4783 |
| 16 | 16645 |
| 17 | 58059 |
| 18 | 203808 |
| 19 | 722575 |
[0,0,0,0,0,0,0,0,2,10,38,127,408,1375,4783,16645, 58059,203808,722575] |