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) |
|---|---|
| 16 | 23 |
| 17 | 340 |
| 18 | 3058 |
| 19 | 20738 |
| 20 | 114232 |
| 21 | 547528 |
| 22 | 2347828 |