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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 37 |
| 9 | 67 |
| 10 | 314 |
| 11 | 2337 |
| 12 | 14010 |
| 13 | 66473 |
| 14 | 405331 |
| 15 | 3843288 |
| 16 | 47944694 |
| 17 | 600390745 |
| 18 | 7673166649 |
| 19 | 120741723116 |
| 20 | 2464557255202 |
[1,7,19,37,67,314,2337,14010,66473,405331,3843288, 47944694,600390745,7673166649,120741723116, 2464557255202] |