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 | 4 |
| 4 | 10 |
| 5 | 25 |
| 6 | 66 |
| 7 | 170 |
| 8 | 441 |
| 9 | 1124 |
| 10 | 2870 |
| 11 | 7273 |
| 12 | 18477 |
| 13 | 46825 |
| 14 | 118917 |
| 15 | 301734 |
| 16 | 766525 |
| 17 | 1946293 |
| 18 | 4944614 |
| 19 | 12557685 |