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 | 4 |
| 2 | 28 |
| 3 | 244 |
| 4 | 2412 |
| 5 | 25804 |
| 6 | 290932 |
| 7 | 3403404 |
| 8 | 40914508 |