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) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 3 |
| 5 | 4 |
| 6 | 9 |
| 7 | 19 |
| 8 | 25 |
| 9 | 39 |
| 10 | 63 |
| 11 | 133 |
| 12 | 157 |
| 13 | 274 |
| 14 | 943 |
| 15 | 1009 |
| 16 | 1353 |
| 17 | 7297 |
| 18 | 16221 |
| 19 | 25256 |
| 20 | 30424 |
| 21 | 52147 |