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 | 19 |
| 2 | 52489 |
| 3 | 59296646043258913 |
| 4 | 3140085798164163223281069127 |
| 5 | 281013956365219695455558985684629594690518822413326510467 |