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 | 2 |
| 2 | 2 |
| 3 | 2 |
| 4 | 2 |
| 5 | 3 |
| 6 | 14 |
| 7 | 31 |
| 8 | 33 |
| 9 | 69 |
| 10 | 137 |
| 11 | 222 |
| 12 | 318 |
| 13 | 901 |
| 14 | 1772 |
| 15 | 2747 |
| 16 | 12347 |
| 17 | 16540 |
| 18 | 18198 |
| 19 | 135794 |
| 20 | 222246 |
| 21 | 570361 |
| 22 | 2134829 |
| 23 | 6901329 |
| 24 | 75503109 |
| 25 | 814558605 |