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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 3 |
| 5 | 7 |
| 6 | 15 |
| 7 | 29 |
| 8 | 469 |
| 9 | 29531 |
| 10 | 1303 |
| 11 | 16103 |
| 12 | 190553 |
| 13 | 128977 |
| 14 | 9061 |
| 15 | 30946717 |
| 16 | 39646461 |
| 17 | 58433327 |
| 18 | 344499373 |
| 19 | 784809203 |
| 20 | 169704792667 |
| 21 | 665690574539 |
| 22 | 5667696059 |
| 23 | 337284946763 |
| 24 | 7964656853269 |
| 25 | 46951444927823 |
| 26 | 284451446729 |
| 27 | 1597747168263479 |
| 28 | 816088653136373 |
[1,3,7,15,29,469,29531,1303,16103,190553,128977, 9061,30946717,39646461,58433327,344499373, 784809203,169704792667,665690574539,5667696059, 337284946763,7964656853269,46951444927823, 284451446729,1597747168263479,816088653136373] |