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) |
|---|---|
| 5 | 0 |
| 6 | 1 |
| 7 | 5 |
| 8 | 20 |
| 9 | 71 |
| 10 | 235 |
| 11 | 753 |
| 12 | 2345 |
| 13 | 7190 |
| 14 | 21753 |
| 15 | 65188 |
| 16 | 193834 |
| 17 | 527743 |
| 18 | 1683615 |
| 19 | 4927394 |
| 20 | 14367845 |
| 21 | 41761634 |
| 22 | 121052806 |
| 23 | 350049108 |
| 24 | 1010123293 |
| 25 | 2909478000 |