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 | 150 |
| 2 | 90 |
| 3 | 2523490710 |
| 4 | 199931532107794273605284333428918544790 |
| 5 | 226413559313153607979257138616992421290 |