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 | 313 |
| 2 | 73477 |
| 3 | 102850464108757 |
| 4 | 2202194587566133922938215539676032221 |