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| n | a(n) |
|---|---|
| 1 | 15 |
| 2 | 255 |
| 3 | 4091 |
| 4 | 65507 |
| 5 | 1048307 |
| 6 | 16772877 |
| 7 | 268366049 |
| 8 | 4293856057 |
| 9 | 68701687597 |
| 10 | 1099226869621 |
| 11 | 17587627901103 |
| 12 | 281402014235147 |
| 13 | 4502431713002299 |
| 14 | 72038899172296611 |
| 15 | 1152622254984043291 |
| 16 | 18441953971381580525 |
[15,255,4091,65507,1048307,16772877,268366049, 4293856057,68701687597,1099226869621, 17587627901103,281402014235147,4502431713002299, 72038899172296611,1152622254984043291, 18441953971381580525] |