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 | 9 |
| 6 | 10 |
| 7 | 1 |
| 8 | 10 |
| 9 | 19 |
| 10 | 10 |
| 11 | 1 |
| 12 | 405 |
| 13 | 2735 |
| 14 | 4825 |
| 15 | 2500 |
| 16 | 1 |
| 17 | 406 |
| 18 | 3140 |
| 19 | 7560 |
| 20 | 7325 |
| 21 | 2500 |
| 22 | 1 |
| 23 | 3953 |
| 24 | 54077 |
| 25 | 213505 |
| 26 | 360580 |
| 27 | 277200 |
| 28 | 80000 |