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) |
|---|---|
| 3 | 1 |
| 4 | 10 |
| 5 | 68 |
| 6 | 394 |
| 7 | 2011 |
| 8 | 10258 |
| 9 | 47327 |
| 10 | 229186 |
| 11 | 1007891 |
| 12 | 4752128 |
| 13 | 20351196 |
| 14 | 94455408 |
| 15 | 398021603 |
| 16 | 1828645056 |
| 17 | 7624936963 |
| 18 | 34786976248 |
| 19 | 144011195937 |
| 20 | 653694082256 |
| 21 | 2692363924059 |
| 22 | 12174658758744 |
| 23 | 49956496140401 |
| 24 | 225233631148500 |
| 25 | 921619221445645 |
| 26 | 4145493852959640 |
| 27 | 16926389947869331 |