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 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 8 |
| 6 | 50 |
| 7 | 294 |
| 8 | 1717 |
| 9 | 10194 |
| 10 | 62284 |
| 11 | 394346 |
| 12 | 2597266 |
| 13 | 17827166 |
| 14 | 127575414 |
| 15 | 951411752 |
| 16 | 7386583917 |
| 17 | 59623674472 |
| 18 | 499648882838 |
| 19 | 4340548090590 |
| 20 | 39033489125836 |
| 21 | 362871600781796 |
| 22 | 3482858492844510 |
| 23 | 34471940635650958 |
| 24 | 351444263328831458 |