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 | 4 |
| 2 | 300304 |
| 3 | 343030433344 |
| 4 | 3433000433443344 |
| 5 | 40330334403443044 |
| 6 | 33330430344333340030340440344044034304 |
| 7 | 434003044400343443044430000434430333044043044 |