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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 5 |
| 5 | 2 |
| 6 | 15 |
| 7 | 42 |
| 8 | 37 |
| 9 | 10 |
| 10 | 105 |
| 11 | 450 |
| 12 | 699 |
| 13 | 458 |
| 14 | 104 |
| 15 | 945 |
| 16 | 5775 |
| 17 | 13845 |
| 18 | 16065 |
| 19 | 8866 |
| 20 | 1816 |
| 21 | 10395 |
| 22 | 85995 |
| 23 | 293265 |
| 24 | 522345 |
| 25 | 506028 |
| 26 | 248660 |
| 27 | 47312 |