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| n | a(n) |
|---|---|
| 1 | 7 |
| 2 | 127 |
| 3 | 1093 |
| 4 | 19531 |
| 5 | 55987 |
| 6 | 5229043 |
| 7 | 8108731 |
| 8 | 25646167 |
| 9 | 321272407 |
| 10 | 917087137 |
| 11 | 3092313043 |
| 12 | 4201025641 |
| 13 | 9684836827 |
| 14 | 31401724537 |
| 15 | 47446779661 |
| 16 | 52379047267 |
| 17 | 83925549247 |
| 18 | 100343116693 |
| 19 | 141276239497 |
| 20 | 153436090543 |
| 21 | 265462278481 |
[7,127,1093,19531,55987,5229043,8108731,25646167, 321272407,917087137,3092313043,4201025641, 9684836827,31401724537,47446779661,52379047267, 83925549247,100343116693,141276239497, 153436090543,265462278481] |