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 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 12 |
| 6 | 35 |
| 7 | 108 |
| 8 | 368 |
| 9 | 1283 |
| 10 | 4639 |
| 11 | 17003 |
| 12 | 63222 |
| 13 | 236819 |
| 14 | 893515 |
| 15 | 3387953 |
| 16 | 12904855 |
| 17 | 49335965 |
| 18 | 189243115 |