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 | 4 |
| 3 | 4 |
| 4 | 31 |
| 5 | 326 |
| 6 | 3716 |
| 7 | 75720 |
| 8 | 2040678 |
| 9 | 86632050 |
| 10 | 5257705657 |