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 | 4 |
| 2 | 5 |
| 3 | 506311 |
| 4 | 4761903 |
| 5 | 506767303 |
| 6 | 5517762660583 |
| 7 | 5554746531623 |
| 8 | 5555541480743 |
| 9 | 5458110152757191 |