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 | 273 |
| 4 | 63973 |
| 5 | 72719023 |
| 6 | 13006678091 |
| 7 | 7817013532691 |