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| n | a(n) |
|---|---|
| 17 | 1 |
| 18 | 0 |
| 19 | 4 |
| 20 | 1 |
| 21 | 6 |
| 22 | 9 |
| 23 | 15 |
| 24 | 23 |
| 25 | 30 |
| 26 | 42 |
| 27 | 93 |
| 28 | 87 |
| 29 | 186 |
| 30 | 206 |
| 31 | 341 |
| 32 | 437 |
| 33 | 567 |
| 34 | 894 |
| 35 | 1048 |
| 36 | 1613 |
| 37 | 1970 |
[1,0,4,1,6,9,15,23,30,42,93,87,186,206,341,437, 567,894,1048,1613,1970] |