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 | 5 |
| 4 | 10 |
| 5 | 71 |
| 6 | 868 |
| 7 | 1788 |
| 8 | 7455 |
| 9 | 44266 |
| 10 | 54626 |
| 11 | 74153 |
| 12 | 224166 |
| 13 | 390471 |
| 14 | 1489304 |
| 15 | 3737961 |
| 16 | 22277163 |
| 17 | 37201631 |
| 18 | 113275744 |
| 19 | 165029426 |
| 20 | 2642368758 |
| 21 | 3362202939 |
| 22 | 5191046363 |
| 23 | 8438525012 |
| 24 | 36226438506 |
| 25 | 40174126779 |
| 26 | 125336047846 |
| 27 | 531802867080 |
| 28 | 599020778171 |