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 | 223 |
| 2 | 16736887 |
| 3 | 104857597567097991823359991 |
| 4 | 11756638905368320778615010897169507936008298389569527 |