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 | 6 |
| 5 | 12 |
| 6 | 30 |
| 7 | 79 |
| 8 | 232 |
| 9 | 716 |
| 10 | 2318 |
| 11 | 7714 |
| 12 | 26270 |
| 13 | 90944 |
| 14 | 319146 |
| 15 | 1132185 |
| 16 | 4053618 |
| 17 | 14626828 |
| 18 | 53136324 |
| 19 | 194174324 |
| 20 | 713267792 |