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) |
|---|---|
| 4 | 0 |
| 5 | 1 |
| 6 | 0 |
| 7 | 2 |
| 8 | 0 |
| 9 | 5 |
| 10 | 9 |
| 11 | 21 |
| 12 | 42 |
| 13 | 76 |
| 14 | 174 |
| 15 | 396 |
| 16 | 888 |
| 17 | 2023 |
| 18 | 4345 |
| 19 | 9921 |
| 20 | 22566 |