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 | 8 |
| 5 | 16 |
| 6 | 50 |
| 7 | 133 |
| 8 | 440 |
| 9 | 1387 |
| 10 | 4752 |
| 11 | 16159 |
| 12 | 56822 |
| 13 | 200474 |
| 14 | 718146 |
| 15 | 2587018 |
| 16 | 9398520 |
| 17 | 34324174 |
| 18 | 126068558 |
| 19 | 465093571 |
| 20 | 1723176308 |
| 21 | 6407924300 |
| 22 | 23910576230 |
| 23 | 89494164973 |
| 24 | 335913918902 |
| 25 | 1264107416466 |