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 | 0 |
| 2 | 2 |
| 3 | 3 |
| 4 | 9 |
| 5 | 15 |
| 6 | 18 |
| 7 | 36 |
| 8 | 63 |
| 9 | 114 |
| 10 | 225 |
| 11 | 405 |
| 12 | 482 |
| 13 | 1241 |
| 14 | 2018 |
| 15 | 9830 |
| 16 | 15795 |
| 17 | 22535 |
| 18 | 27752 |
| 19 | 41033 |
| 20 | 95574 |
| 21 | 131144 |
| 22 | 156221 |