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 | 5 |
| 2 | 5 |
| 3 | 159 |
| 4 | 569 |
| 5 | 1557 |
| 6 | 2439 |
| 7 | 25353 |
| 8 | 24317 |
| 9 | 164073 |