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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 10 |
| 7 | 28 |
| 8 | 64 |
| 9 | 169 |
| 10 | 422 |
| 11 | 1108 |
| 12 | 2872 |
| 13 | 7627 |
| 14 | 20202 |
| 15 | 54216 |
| 16 | 145867 |
| 17 | 395288 |
[1,0,1,2,5,10,28,64,169,422,1108,2872,7627,20202, 54216,145867,395288] |