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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 37 |
| 9 | 106 |
| 10 | 470 |
| 11 | 2439 |
| 12 | 14648 |
| 13 | 89078 |
| 14 | 630810 |
| 15 | 5607878 |
| 16 | 61467315 |
| 17 | 775395804 |
| 18 | 11138538259 |
| 19 | 187481058138 |
[1,7,19,37,106,470,2439,14648,89078,630810, 5607878,61467315,775395804,11138538259, 187481058138] |