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 | 83 |
| 2 | 15629 |
| 3 | 279941 |
| 4 | 3486784409 |
| 5 | 6568408355712890639 |