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 | 11 |
| 2 | 66 |
| 3 | 297 |
| 4 | 1122 |
| 5 | 3740 |
| 6 | 11341 |
| 7 | 31922 |
| 8 | 84535 |
| 9 | 212707 |
| 10 | 512369 |
| 11 | 1188353 |
| 12 | 2666048 |
| 13 | 5807296 |
| 14 | 12319659 |
| 15 | 25518757 |
| 16 | 51725289 |
| 17 | 102786959 |
| 18 | 200568907 |
| 19 | 384847199 |
| 20 | 727019260 |
| 21 | 1353654049 |
| 22 | 2486522369 |
| 23 | 4509972819 |
| 24 | 8083287432 |
| 25 | 14326409152 |
| 26 | 25124415635 |
| 27 | 43622744968 |
| 28 | 75026666913 |
| 29 | 127882738709 |