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 | 1 |
| 2 | 2 |
| 3 | 2 |
| 4 | 4 |
| 5 | 4 |
| 6 | 10 |
| 7 | 13 |
| 8 | 28 |
| 9 | 46 |
| 10 | 99 |
| 11 | 175 |
| 12 | 359 |
| 13 | 672 |
| 14 | 1358 |
| 15 | 2627 |
| 16 | 5238 |
| 17 | 10262 |
| 18 | 20438 |
| 19 | 40320 |
| 20 | 80137 |