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| n | a(n) |
|---|---|
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 0 |
| 6 | 3 |
| 7 | 3 |
| 8 | 0 |
| 9 | 9 |
| 10 | 28 |
| 11 | 6 |
| 12 | 0 |
| 13 | 21 |
| 14 | 150 |
| 15 | 125 |
| 16 | 12 |
| 17 | 0 |
| 18 | 45 |
| 19 | 760 |
| 20 | 1350 |
| 21 | 390 |
| 22 | 20 |
[0,0,1,0,3,3,0,9,28,6,0,21,150,125,12,0,45,760, 1350,390,20] |