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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 37 |
| 9 | 61 |
| 10 | 275 |
| 11 | 1767 |
| 12 | 10441 |
| 13 | 45245 |
| 14 | 228435 |
| 15 | 1707103 |
| 16 | 18329337 |
| 17 | 206589973 |
| 18 | 2188693403 |
| 19 | 25302969335 |
| 20 | 385488957361 |
| 21 | 7496386108989 |
[1,7,19,37,61,275,1767,10441,45245,228435,1707103, 18329337,206589973,2188693403,25302969335, 385488957361,7496386108989] |