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 | 3 |
| 3 | 4 |
| 4 | 8 |
| 5 | 18 |
| 6 | 41 |
| 7 | 104 |
| 8 | 253 |
| 9 | 579 |
| 10 | 1370 |
| 11 | 3184 |
| 12 | 7331 |
| 13 | 16720 |
| 14 | 38720 |
| 15 | 91720 |
| 16 | 218038 |
| 17 | 518268 |
| 18 | 1259464 |
| 19 | 3141644 |
| 20 | 7687556 |
| 21 | 18460394 |
| 22 | 45409204 |
| 23 | 115174672 |
| 24 | 283748621 |
| 25 | 680088840 |
| 26 | 1665189408 |
| 27 | 4207220068 |
| 28 | 10403856572 |
| 29 | 25304979704 |
| 30 | 62881939100 |
| 31 | 161253396400 |
| 32 | 396959041273 |