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 | 14 |
| 4 | 52 |
| 5 | 42 |
| 6 | 310 |
| 7 | 0 |
| 8 | 684 |
| 9 | 584 |
| 10 | 1092 |
| 11 | 0 |
| 12 | 4788 |
| 13 | 0 |
| 14 | 7320 |
| 15 | 0 |
| 16 | 0 |
| 17 | 3276 |
| 18 | 31314 |
| 19 | 0 |
| 20 | 32004 |
| 21 | 0 |
| 22 | 0 |
| 23 | 0 |