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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 37 |
| 9 | 133 |
| 10 | 535 |
| 11 | 2615 |
| 12 | 17587 |
| 13 | 119298 |
| 14 | 919700 |
| 15 | 8881748 |
| 16 | 102328225 |
| 17 | 1400493835 |
| 18 | 22807381469 |
| 19 | 434028590353 |
[1,7,19,37,133,535,2615,17587,119298,919700, 8881748,102328225,1400493835,22807381469, 434028590353] |