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 | 3 |
| 2 | 11 |
| 3 | 123 |
| 4 | 15131 |
| 5 | 228947163 |
| 6 | 52416803445748571 |
| 7 | 2747521283470239265968814548542043 |
| 8 | 7548873203121950871924356140057489033996373873303512592376938613851 |