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 | 2 |
| 2 | 3 |
| 3 | 7 |
| 4 | 25 |
| 5 | 137 |
| 6 | 1123 |
| 7 | 13103 |
| 8 | 204045 |
| 9 | 4050293 |
| 10 | 99440273 |