This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| 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 |