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) |
|---|---|
| 0 | 0 |
| 1 | 36 |
| 2 | 4356 |
| 3 | 443556 |
| 4 | 44435556 |
| 5 | 4444355556 |
| 6 | 444443555556 |
| 7 | 44444435555556 |
| 8 | 4444444355555556 |
| 9 | 444444443555555556 |
| 10 | 44444444435555555556 |
| 11 | 4444444444355555555556 |
| 12 | 444444444443555555555556 |
| 13 | 44444444444435555555555556 |
| 14 | 4444444444444355555555555556 |
| 15 | 444444444444443555555555555556 |