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 | 2 |
| 2 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 53 |
| 6 | 29 |
| 7 | 353 |
| 8 | 1549 |
| 9 | 8353 |
| 10 | 7 |
| 11 | 15889 |
| 12 | 1691419 |
| 13 | 347 |
| 14 | 67 |
| 15 | 1097 |
| 16 | 274177 |
| 17 | 43 |
| 18 | 18882774223 |
| 19 | 67 |
| 20 | 5197 |
| 21 | 1801088543 |
| 22 | 556114086547 |
| 23 | 44773 |
| 24 | 3062989 |
| 25 | 5641 |
| 26 | 92553847628747 |
| 27 | 18349361 |
| 28 | 607 |
| 29 | 51131 |
| 30 | 13217 |
| 31 | 42806180589950051 |