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 | 5 |
| 3 | 13 |
| 4 | 75 |
| 5 | 415 |
| 6 | 2821 |
| 7 | 19657 |
| 8 | 144871 |
| 9 | 1090645 |
| 10 | 8392423 |
| 11 | 65527045 |
| 12 | 518173267 |
| 13 | 4139803293 |
| 14 | 33366946637 |