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 | 3 |
| 3 | 3 |
| 4 | 2 |
| 5 | 23 |
| 6 | 18 |
| 7 | 6 |
| 8 | 270 |
| 9 | 166 |
| 10 | 28 |
| 11 | 4842 |
| 12 | 2532 |
| 13 | 244 |
| 14 | 120052 |
| 15 | 49620 |
| 16 | 2544 |
| 17 | 3852972 |
| 18 | 1270832 |
| 19 | 35600 |
| 20 | 156145080 |
| 21 | 40668960 |
| 22 | 659632 |
| 23 | 7746956424 |
| 24 | 1606984224 |
| 25 | 15106128 |
| 26 | 460265296128 |
| 27 | 75930070688 |
| 28 | 425802176 |