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 | 5 |
| 3 | 6 |
| 4 | 7 |
| 5 | 8 |
| 6 | 9 |
| 7 | 11 |
| 8 | 12 |
| 9 | 15 |
| 10 | 21 |
| 11 | 22 |
| 12 | 26 |
| 13 | 38 |
| 14 | 88 |
| 15 | 109 |
| 16 | 173 |
| 17 | 212 |
| 18 | 235 |
| 19 | 264 |
| 20 | 3114 |
| 21 | 81619 |