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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 7 |
| 8 | 19 |
| 9 | 37 |
| 10 | 103 |
| 11 | 427 |
| 12 | 2227 |
| 13 | 11583 |
| 14 | 57485 |
| 15 | 387397 |
| 16 | 3244887 |
| 17 | 30976146 |
| 18 | 318914841 |
[1,7,19,37,103,427,2227,11583,57485,387397, 3244887,30976146,318914841] |