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 | 2 |
| 1 | 5 |
| 2 | 197 |
| 3 | 7761797 |
| 4 | 467613464999866416197 |
| 5 | 102249460387306384473056172738577521087843948916391508591105797 |