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 | 3 |
| 2 | 8 |
| 3 | 22 |
| 4 | 53 |
| 5 | 138 |
| 6 | 317 |
| 7 | 803 |
| 8 | 1794 |
| 9 | 4478 |
| 10 | 9823 |
| 11 | 24321 |
| 12 | 52662 |
| 13 | 129815 |
| 14 | 278365 |
| 15 | 684689 |
| 16 | 1457113 |
| 17 | 3581074 |
| 18 | 7574863 |
| 19 | 18616678 |
| 20 | 39182980 |
| 21 | 96351078 |
| 22 | 201947877 |
| 23 | 497006898 |
| 24 | 1038017513 |
| 25 | 2557192089 |
| 26 | 5324505911 |
| 27 | 13131212951 |
| 28 | 27268815916 |