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 | 18 |
| 6 | 5 |
| 7 | 1 |
| 8 | 179 |
| 9 | 479 |
| 10 | 61 |
| 11 | 1 |
| 12 | 1636 |
| 13 | 18270 |
| 14 | 19028 |
| 15 | 1385 |
| 16 | 1 |
| 17 | 14757 |
| 18 | 540242 |
| 19 | 1949762 |
| 20 | 1073517 |
| 21 | 50521 |
| 22 | 1 |
| 23 | 132854 |
| 24 | 14494859 |
| 25 | 137963364 |
| 26 | 241595239 |
| 27 | 82112518 |
| 28 | 2702765 |