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 | 33 |
| 3 | 285 |
| 4 | 2643 |
| 5 | 24920 |
| 6 | 239543 |
| 7 | 2327458 |
| 8 | 22801065 |
| 9 | 224608236 |
| 10 | 2222034266 |
| 11 | 22053438268 |