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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 7 |
| 6 | 19 |
| 7 | 37 |
| 8 | 61 |
| 9 | 275 |
| 10 | 2315 |
| 11 | 14549 |
| 12 | 65253 |
| 13 | 367867 |
| 14 | 3643355 |
| 15 | 50258373 |
| 16 | 656861493 |
| 17 | 8054133067 |
| 18 | 125882858619 |
| 19 | 2726987375461 |
| 20 | 73216488029301 |
| 21 | 2108368359421323 |
| 22 | 66596647574072923 |
[1,7,19,37,61,275,2315,14549,65253,367867,3643355, 50258373,656861493,8054133067,125882858619, 2726987375461,73216488029301,2108368359421323, 66596647574072923] |