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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 37 |
| 9 | 100 |
| 10 | 428 |
| 11 | 1830 |
| 12 | 11336 |
| 13 | 67788 |
| 14 | 454698 |
| 15 | 3575689 |
| 16 | 35749465 |
| 17 | 410313440 |
| 18 | 5458200826 |
| 19 | 83668909890 |
[1,7,19,37,100,428,1830,11336,67788,454698, 3575689,35749465,410313440,5458200826,83668909890] |