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 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 15 |
| 6 | 48 |
| 7 | 133 |
| 8 | 456 |
| 9 | 1439 |
| 10 | 5060 |
| 11 | 16797 |
| 12 | 60693 |
| 13 | 208013 |
| 14 | 760326 |
| 15 | 2677217 |
| 16 | 9879513 |
| 17 | 35357671 |
| 18 | 131763844 |
| 19 | 477638701 |
| 20 | 1790943777 |
| 21 | 6566420517 |
| 22 | 24748372638 |
| 23 | 91482563641 |
| 24 | 346597488614 |
| 25 | 1289904685149 |
| 26 | 4905215393598 |
| 27 | 18370277279665 |
| 28 | 70085754999907 |
| 29 | 263747951750361 |