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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 37 |
| 9 | 67 |
| 10 | 293 |
| 11 | 1143 |
| 12 | 6649 |
| 13 | 34591 |
| 14 | 193101 |
| 15 | 1138893 |
| 16 | 9302387 |
| 17 | 87311631 |
| 18 | 959238749 |
| 19 | 11114012263 |
| 20 | 149535615901 |
| 21 | 2269866358921 |
[1,7,19,37,67,293,1143,6649,34591,193101,1138893, 9302387,87311631,959238749,11114012263, 149535615901,2269866358921] |