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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 7 |
| 7 | 19 |
| 8 | 37 |
| 9 | 61 |
| 10 | 257 |
| 11 | 2034 |
| 12 | 12328 |
| 13 | 53385 |
| 14 | 258324 |
| 15 | 2321815 |
| 16 | 29642532 |
| 17 | 362215522 |
| 18 | 3875443645 |
| 19 | 50070184746 |
| 20 | 929942357232 |
| 21 | 22058196563695 |
[1,7,19,37,61,257,2034,12328,53385,258324,2321815, 29642532,362215522,3875443645,50070184746, 929942357232,22058196563695] |