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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 17 |
| 3 | 31 |
| 4 | 4801 |
| 5 | 881 |
| 6 | 8191 |
| 7 | 388961 |
| 8 | 1419263 |
| 9 | 4046849 |
| 10 | 36171409 |
| 11 | 4620799 |
| 12 | 617831551 |
| 13 | 170918749 |
| 14 | 842277599279 |
| 15 | 3554663111 |
| 16 | 187753824257 |
| 17 | 19854354911 |
| 18 | 1233008445689 |
| 19 | 60292968751 |
| 20 | 508070657249 |
| 21 | 4421151404801 |
| 22 | 259476225058051 |
| 23 | 17431549081705001 |
| 24 | 45163738135361 |
| 25 | 99913980938200001 |
[3,17,31,4801,881,8191,388961,1419263,4046849, 36171409,4620799,617831551,170918749,842277599279, 3554663111,187753824257,19854354911,1233008445689, 60292968751,508070657249,4421151404801, 259476225058051,17431549081705001,45163738135361, 99913980938200001] |