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 | 11 |
| 6 | 29 |
| 7 | 72 |
| 8 | 191 |
| 9 | 478 |
| 10 | 1211 |
| 11 | 2973 |
| 12 | 7274 |
| 13 | 17455 |
| 14 | 41645 |
| 15 | 98271 |
| 16 | 230848 |
| 17 | 539000 |
| 18 | 1254936 |