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 | 2 |
| 2 | 5 |
| 3 | 188286357631 |
| 4 | 15018933029959449607893431916515023 |
| 5 | 1643356469972045002664087635582629208716484341598400533 |