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 | 2 |
| 2 | 21 |
| 3 | 321 |
| 4 | 7721 |
| 5 | 184729 |
| 6 | 185145 |
| 7 | 21110729 |
| 8 | 54929017 |
| 9 | 134099385 |
| 10 | 3331670169 |