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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 7 |
| 6 | 19 |
| 7 | 37 |
| 8 | 61 |
| 9 | 503 |
| 10 | 4407 |
| 11 | 23093 |
| 12 | 93285 |
| 13 | 817543 |
| 14 | 14192015 |
| 15 | 204195517 |
| 16 | 2243020429 |
| 17 | 32774055967 |
| 18 | 863753860919 |
| 19 | 27738606644581 |
| 20 | 798910205504069 |
| 21 | 24797177099870103 |
[1,7,19,37,61,503,4407,23093,93285,817543, 14192015,204195517,2243020429,32774055967, 863753860919,27738606644581,798910205504069, 24797177099870103] |