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 | 50 |
| 2 | 1682 |
| 3 | 3971273138702695316402 |
| 4 | 367680737852094722224630791187352516632102802 |