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) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 21 |
| 3 | 358 |
| 4 | 92007 |
| 5 | 6029862760 |
| 6 | 25898063359598159721 |
| 7 | 477734946799221833229035410333259818858 |
| 8 | 162564778457687820218065957445498785826947155451688293007128627114802460256107 |