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 | 2 |
| 2 | 7 |
| 3 | 18 |
| 4 | 163 |
| 5 | 1454 |
| 6 | 21837 |
| 7 | 492116 |
| 8 | 23699853 |
| 9 | 1507394232 |