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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 1 |
| 7 | 4 |
| 8 | 7 |
| 9 | 17 |
| 10 | 36 |
| 11 | 88 |
| 12 | 196 |
| 13 | 481 |
| 14 | 1148 |
| 15 | 2838 |
| 16 | 7020 |
| 17 | 17708 |
| 18 | 44837 |
| 19 | 114971 |
| 20 | 296457 |
[1,1,4,7,17,36,88,196,481,1148,2838,7020,17708, 44837,114971,296457] |