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 | 5 |
| 1 | 454 |
| 2 | 44544 |
| 3 | 4445444 |
| 4 | 444454444 |
| 5 | 44444544444 |
| 6 | 4444445444444 |
| 7 | 444444454444444 |
| 8 | 44444444544444444 |
| 9 | 4444444445444444444 |
| 10 | 444444444454444444444 |
| 11 | 44444444444544444444444 |
| 12 | 4444444444445444444444444 |
| 13 | 444444444444454444444444444 |
| 14 | 44444444444444544444444444444 |
| 15 | 4444444444444445444444444444444 |