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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 7 |
| 7 | 3 |
| 8 | 15 |
| 9 | 85 |
| 10 | 173 |
| 11 | 119 |
| 12 | 961 |
| 13 | 663 |
| 14 | 8045 |
| 15 | 17637 |
| 16 | 51033 |
| 17 | 54475 |
| 18 | 312455 |
| 19 | 663535 |
| 20 | 950235 |
| 21 | 5936673 |
| 22 | 1684037 |
| 23 | 39993895 |
| 24 | 87986917 |
| 25 | 128989251 |
| 26 | 205059181 |
| 27 | 949737339 |
| 28 | 2861515293 |
| 29 | 400296173 |
| 30 | 19018424205 |