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| n | a(n) |
|---|---|
| 7 | 1 |
| 8 | 7 |
| 9 | 19 |
| 10 | 37 |
| 11 | 106 |
| 12 | 313 |
| 13 | 1348 |
| 14 | 6817 |
| 15 | 32547 |
| 16 | 189413 |
| 17 | 1214982 |
| 18 | 8891593 |
| 19 | 78525607 |
| 20 | 761546216 |
[1,7,19,37,106,313,1348,6817,32547,189413,1214982, 8891593,78525607,761546216] |