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 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 4 |
| 4 | 6 |
| 5 | 18 |
| 6 | 32 |
| 7 | 85 |
| 8 | 165 |
| 9 | 411 |
| 10 | 839 |
| 11 | 2013 |
| 12 | 4237 |
| 13 | 9933 |
| 14 | 21317 |
| 15 | 49236 |
| 16 | 107014 |
| 17 | 244750 |
| 18 | 536500 |
| 19 | 1218888 |
| 20 | 2687362 |
| 21 | 6077644 |
| 22 | 13453606 |
| 23 | 30329434 |
| 24 | 67326816 |
| 25 | 151439158 |
| 26 | 336842092 |
| 27 | 756452890 |
| 28 | 1684953360 |
| 29 | 3779590010 |
| 30 | 8427441240 |