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 | 11 |
| 2 | 13 |
| 3 | 21 |
| 4 | 47 |
| 5 | 59 |
| 6 | 77 |
| 7 | 109 |
| 8 | 129 |
| 9 | 155 |
| 10 | 163 |
| 11 | 245 |
| 12 | 337 |
| 13 | 511 |
| 14 | 1417 |
| 15 | 3013 |
| 16 | 3757 |
| 17 | 4989 |
| 18 | 8977 |
| 19 | 12479 |
| 20 | 12869 |