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 | 2 |
| 3 | 5 |
| 4 | 14 |
| 5 | 41 |
| 6 | 124 |
| 7 | 384 |
| 8 | 1210 |
| 9 | 3861 |
| 10 | 12434 |
| 11 | 40313 |
| 12 | 131332 |
| 13 | 429250 |
| 14 | 1405696 |
| 15 | 4606898 |
| 16 | 15093714 |
| 17 | 49386035 |
| 18 | 161204470 |
| 19 | 524361475 |
| 20 | 1697564726 |
| 21 | 5461804480 |
| 22 | 17433977340 |
| 23 | 55085418075 |
| 24 | 171777442668 |
| 25 | 526480895241 |
| 26 | 1576234101044 |
| 27 | 4565064570082 |
| 28 | 12573573588000 |