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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 7 |
| 6 | 19 |
| 7 | 37 |
| 8 | 61 |
| 9 | 547 |
| 10 | 3879 |
| 11 | 20553 |
| 12 | 82301 |
| 13 | 862099 |
| 14 | 11383399 |
| 15 | 147116137 |
| 16 | 1584915709 |
| 17 | 26192809787 |
| 18 | 600459150255 |
| 19 | 15941874201057 |
[1,7,19,37,61,547,3879,20553,82301,862099, 11383399,147116137,1584915709,26192809787, 600459150255,15941874201057] |