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 | 0 |
| 2 | 0 |
| 3 | 2 |
| 4 | 4 |
| 5 | 2 |
| 6 | 10 |
| 7 | 12 |
| 8 | 34 |
| 9 | 54 |
| 10 | 128 |
| 11 | 214 |
| 12 | 444 |
| 13 | 768 |
| 14 | 1476 |
| 15 | 2730 |
| 16 | 5118 |
| 17 | 9768 |
| 18 | 18282 |
| 19 | 34682 |
| 20 | 65390 |
| 21 | 123772 |
| 22 | 236620 |