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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 1 |
| 6 | 3 |
| 7 | 11 |
| 8 | 69 |
| 9 | 541 |
| 10 | 5096 |
| 11 | 50586 |
| 12 | 534292 |
| 13 | 5865150 |
| 14 | 66582243 |
| 15 | 776705379 |
| 16 | 9274453627 |
| 17 | 112984297173 |
[1,1,3,11,69,541,5096,50586,534292,5865150, 66582243,776705379,9274453627,112984297173] |