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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 7 |
| 6 | 19 |
| 7 | 37 |
| 8 | 82 |
| 9 | 439 |
| 10 | 3622 |
| 11 | 21277 |
| 12 | 115970 |
| 13 | 907157 |
| 14 | 11150700 |
| 15 | 162360713 |
| 16 | 2286713291 |
| 17 | 36892603949 |
| 18 | 784002340205 |
| 19 | 21639656177753 |
[1,7,19,37,82,439,3622,21277,115970,907157, 11150700,162360713,2286713291,36892603949, 784002340205,21639656177753] |