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 | 2 |
| 2 | 5 |
| 3 | 12 |
| 4 | 31 |
| 5 | 84 |
| 6 | 233 |
| 7 | 656 |
| 8 | 1865 |
| 9 | 5338 |
| 10 | 15355 |
| 11 | 44342 |
| 12 | 128455 |
| 13 | 373100 |
| 14 | 1086087 |
| 15 | 3167634 |
| 16 | 9254009 |
| 17 | 27074666 |
| 18 | 79316491 |
| 19 | 232633206 |
| 20 | 683026535 |
| 21 | 2007327660 |
| 22 | 5904415195 |
| 23 | 17381265934 |
| 24 | 51203990457 |
| 25 | 150945252394 |
| 26 | 445252685313 |