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 | 5 |
| 3 | 11 |
| 4 | 13 |
| 5 | 17 |
| 6 | 43 |
| 7 | 241 |
| 8 | 257 |
| 9 | 331 |
| 10 | 683 |
| 11 | 2731 |
| 12 | 5419 |
| 13 | 43691 |
| 14 | 61681 |
| 15 | 65537 |
| 16 | 174763 |
| 17 | 2796203 |
| 18 | 15790321 |
| 19 | 18837001 |
| 20 | 22366891 |
| 21 | 715827883 |
| 22 | 4278255361 |
| 23 | 4562284561 |
| 24 | 77158673929 |
| 25 | 1133836730401 |
| 26 | 2932031007403 |
| 27 | 4363953127297 |