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 | 1 |
| 2 | 3 |
| 3 | 7 |
| 4 | 9 |
| 5 | 15 |
| 6 | 39 |
| 7 | 57 |
| 8 | 81 |
| 9 | 105 |
| 10 | 1239 |
| 11 | 5569 |
| 12 | 9457 |
| 13 | 11095 |
| 14 | 11631 |
| 15 | 12327 |
| 16 | 37633 |
| 17 | 63247 |
| 18 | 216457 |