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 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 0 |
| 10 | 1 |
| 11 | 0 |
| 12 | 2 |
| 13 | 0 |
| 14 | 8 |
| 15 | 0 |
| 16 | 48 |
| 17 | 0 |
| 18 | 450 |
| 19 | 1 |
| 20 | 5753 |
| 21 | 8 |
| 22 | 90684 |
| 23 | 3917 |
| 24 | 1736764 |
| 25 | 4131991 |
| 26 | 163457964 |
| 27 | 4018022149 |
| 28 | 119021971348 |