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 | 4 |
| 2 | 7 |
| 3 | 9 |
| 4 | 13 |
| 5 | 19 |
| 6 | 23 |
| 7 | 37 |
| 8 | 71 |
| 9 | 89 |
| 10 | 97 |
| 11 | 131 |
| 12 | 167 |
| 13 | 193 |
| 14 | 227 |
| 15 | 229 |
| 16 | 257 |
| 17 | 263 |
| 18 | 269 |
| 19 | 271 |