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 | 9 |
| 2 | 23 |
| 3 | 180 |
| 4 | 1325 |
| 5 | 10334 |
| 6 | 83556 |
| 7 | 710667 |
| 8 | 6148698 |
| 9 | 54619717 |
| 10 | 491432596 |
| 11 | 4471325309 |
| 12 | 40951585117 |