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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 4 |
| 6 | 12 |
| 7 | 27 |
| 8 | 78 |
| 9 | 208 |
| 10 | 637 |
| 11 | 1870 |
| 12 | 5797 |
| 13 | 17866 |
| 14 | 56237 |
| 15 | 177573 |
| 16 | 566904 |
| 17 | 1818527 |
| 18 | 5874180 |
| 19 | 19065038 |