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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 37 |
| 9 | 61 |
| 10 | 224 |
| 11 | 1849 |
| 12 | 11422 |
| 13 | 49927 |
| 14 | 232499 |
| 15 | 1829873 |
| 16 | 22757837 |
| 17 | 281467930 |
| 18 | 3021365293 |
| 19 | 36143191129 |
| 20 | 595788136987 |
| 21 | 13215044372764 |
[1,7,19,37,61,224,1849,11422,49927,232499,1829873, 22757837,281467930,3021365293,36143191129, 595788136987,13215044372764] |