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 | 3 |
| 2 | 43 |
| 3 | 443 |
| 4 | 4441 |
| 5 | 44417 |
| 6 | 444443 |
| 7 | 4444409 |
| 8 | 44444399 |
| 9 | 444444443 |
| 10 | 4444444429 |
| 11 | 44444444441 |
| 12 | 444444444443 |
| 13 | 4444444444439 |
| 14 | 44444444444353 |
| 15 | 444444444444421 |
| 16 | 4444444444444423 |
| 17 | 44444444444444411 |
| 18 | 444444444444444419 |