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 | 5 |
| 2 | 11 |
| 3 | 13 |
| 4 | 19 |
| 5 | 23 |
| 6 | 29 |
| 7 | 53 |
| 8 | 61 |
| 9 | 113 |
| 10 | 239 |
| 11 | 251 |
| 12 | 503 |
| 13 | 1013 |
| 14 | 1021 |
| 15 | 4093 |
| 16 | 8191 |
| 17 | 65519 |
| 18 | 65521 |
| 19 | 262133 |
| 20 | 1048571 |
| 21 | 4194301 |
| 22 | 302231454903657293676533 |