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 | 3 |
| 2 | 9 |
| 3 | 30 |
| 4 | 95 |
| 5 | 326 |
| 6 | 1195 |
| 7 | 4478 |
| 8 | 17251 |
| 9 | 67326 |
| 10 | 266331 |
| 11 | 1058146 |
| 12 | 4216075 |
| 13 | 16808282 |
| 14 | 67130923 |
| 15 | 268281390 |
| 16 | 1072424939 |