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 | 3 |
| 2 | 7 |
| 3 | 19 |
| 4 | 109 |
| 5 | 131 |
| 6 | 607 |
| 7 | 863 |
| 8 | 2917 |
| 9 | 5923 |
| 10 | 12421 |
| 11 | 187507 |
| 12 | 353501 |
| 13 | 817519 |