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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 3 |
| 6 | 7 |
| 7 | 14 |
| 8 | 25 |
| 9 | 41 |
| 10 | 63 |
| 11 | 93 |
| 12 | 132 |
| 13 | 182 |
| 14 | 244 |
| 15 | 321 |
| 16 | 414 |
| 17 | 526 |
| 18 | 658 |
| 19 | 814 |
[1,0,0,0,1,3,7,14,25,41,63,93,132,182,244,321,414, 526,658,814] |