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 | 3 |
| 3 | 3 |
| 4 | 7 |
| 5 | 14 |
| 6 | 35 |
| 7 | 85 |
| 8 | 231 |
| 9 | 633 |
| 10 | 1845 |
| 11 | 5461 |
| 12 | 16707 |
| 13 | 51945 |
| 14 | 164695 |
| 15 | 529077 |
| 16 | 1722279 |
| 17 | 5664794 |
| 18 | 18813369 |
| 19 | 62996850 |
| 20 | 212533226 |
| 21 | 721792761 |
| 22 | 2466135375 |
| 23 | 8471967938 |
| 24 | 29249059293 |
| 25 | 101440962296 |
| 26 | 353289339927 |
| 27 | 1235154230060 |