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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 1 |
| 6 | 5 |
| 7 | 9 |
| 8 | 25 |
| 9 | 65 |
| 10 | 311 |
| 11 | 777 |
| 12 | 5163 |
| 13 | 19629 |
| 14 | 179101 |
| 15 | 938309 |
| 16 | 11522939 |
| 17 | 83049733 |
| 18 | 1385281995 |
| 19 | 13583413581 |
| 20 | 310426685067 |
| 21 | 4145583315227 |
| 22 | 129859229238145 |
[1,1,1,3,1,5,9,25,65,311,777,5163,19629,179101, 938309,11522939,83049733,1385281995,13583413581, 310426685067,4145583315227,129859229238145] |