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 | 7 |
| 3 | 8 |
| 4 | 23 |
| 5 | 31 |
| 6 | 209 |
| 7 | 240 |
| 8 | 689 |
| 9 | 929 |
| 10 | 6263 |
| 11 | 7192 |
| 12 | 20647 |
| 13 | 27839 |
| 14 | 187681 |
| 15 | 215520 |
| 16 | 618721 |
| 17 | 834241 |
| 18 | 5624167 |
| 19 | 6458408 |
| 20 | 18540983 |
| 21 | 24999391 |
| 22 | 168537329 |
| 23 | 193536720 |
| 24 | 555610769 |
| 25 | 749147489 |
| 26 | 5050495703 |
| 27 | 5799643192 |
| 28 | 16649782087 |