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 | 433 |
| 4 | 443 |
| 5 | 3343 |
| 6 | 3433 |
| 7 | 33343 |
| 8 | 333433 |
| 9 | 334333 |
| 10 | 343333 |
| 11 | 343433 |
| 12 | 444343 |
| 13 | 444443 |
| 14 | 3333433 |
| 15 | 3343343 |
| 16 | 3343433 |
| 17 | 3344333 |
| 18 | 3344443 |
| 19 | 3433333 |
| 20 | 3434443 |
| 21 | 3443443 |
| 22 | 3444443 |
| 23 | 4344443 |
| 24 | 4433333 |
| 25 | 4434343 |
| 26 | 4443433 |
| 27 | 34333333 |
| 28 | 34434343 |
| 29 | 34444343 |
| 30 | 43444433 |