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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 7 |
| 6 | 19 |
| 7 | 37 |
| 8 | 144 |
| 9 | 940 |
| 10 | 6913 |
| 11 | 44442 |
| 12 | 383165 |
| 13 | 4775804 |
| 14 | 73750670 |
| 15 | 1270986469 |
| 16 | 26693174009 |
| 17 | 724206936085 |
| 18 | 24621385504435 |
[1,7,19,37,144,940,6913,44442,383165,4775804, 73750670,1270986469,26693174009,724206936085, 24621385504435] |