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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 13 |
| 3 | 15 |
| 4 | 25 |
| 5 | 39 |
| 6 | 47 |
| 7 | 51 |
| 8 | 69 |
| 9 | 81 |
| 10 | 101 |
| 11 | 139 |
| 12 | 249 |
| 13 | 261 |
| 14 | 275 |
| 15 | 291 |
| 16 | 739 |
| 17 | 1243 |
| 18 | 2243 |