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 | 9 |
| 3 | 32 |
| 4 | 107 |
| 5 | 347 |
| 6 | 1108 |
| 7 | 3515 |
| 8 | 11132 |
| 9 | 35219 |
| 10 | 111391 |
| 11 | 352269 |
| 12 | 1113996 |
| 13 | 3522791 |
| 14 | 11140072 |
| 15 | 35228031 |
| 16 | 111400846 |
| 17 | 352280442 |
| 18 | 1114008610 |
| 19 | 3522804578 |
| 20 | 11140086260 |