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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 7 |
| 6 | 19 |
| 7 | 37 |
| 8 | 82 |
| 9 | 477 |
| 10 | 3794 |
| 11 | 21306 |
| 12 | 111679 |
| 13 | 917243 |
| 14 | 11877917 |
| 15 | 168569675 |
| 16 | 2255808102 |
| 17 | 36229000672 |
| 18 | 799414704118 |
| 19 | 22475315426770 |
[1,7,19,37,82,477,3794,21306,111679,917243, 11877917,168569675,2255808102,36229000672, 799414704118,22475315426770] |