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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 7 |
| 6 | 15 |
| 7 | 32 |
| 8 | 70 |
| 9 | 144 |
| 10 | 311 |
| 11 | 653 |
| 12 | 1354 |
| 13 | 2820 |
| 14 | 5850 |
| 15 | 12054 |
| 16 | 24810 |
| 17 | 50923 |
| 18 | 104206 |
| 19 | 212841 |
| 20 | 433919 |
| 21 | 882930 |
| 22 | 1793810 |
| 23 | 3639248 |
| 24 | 7373539 |
| 25 | 14921986 |