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 | 55 |
| 2 | 23527 |
| 3 | 18914231 |
| 4 | 11903604235 |
| 5 | 6715679348165 |
| 6 | 3637116511064523 |