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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 7 |
| 6 | 19 |
| 7 | 37 |
| 8 | 82 |
| 9 | 439 |
| 10 | 3646 |
| 11 | 20995 |
| 12 | 111047 |
| 13 | 888450 |
| 14 | 11127243 |
| 15 | 160502934 |
| 16 | 2195406729 |
| 17 | 35231318268 |
| 18 | 762257930909 |
| 19 | 21186573131078 |
| 20 | 666712624377399 |
[1,7,19,37,82,439,3646,20995,111047,888450, 11127243,160502934,2195406729,35231318268, 762257930909,21186573131078,666712624377399] |