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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 37 |
| 9 | 100 |
| 10 | 521 |
| 11 | 3034 |
| 12 | 15439 |
| 13 | 84733 |
| 14 | 680192 |
| 15 | 6722018 |
| 16 | 71127189 |
| 17 | 839682580 |
| 18 | 12147844032 |
[1,7,19,37,100,521,3034,15439,84733,680192, 6722018,71127189,839682580,12147844032] |