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 | 3 |
| 1 | 2 |
| 2 | 223 |
| 3 | 2221 |
| 4 | 22229 |
| 5 | 1222229 |
| 6 | 20222227 |
| 7 | 22222223 |
| 8 | 222222227 |
| 9 | 20222222221 |
| 10 | 22222222223 |
| 11 | 2122222222229 |
| 12 | 21222222222221 |
| 13 | 22222222222229 |
| 14 | 222222222222227 |
| 15 | 21222222222222221 |
| 16 | 202222222222222229 |
| 17 | 222222222222222221 |
| 18 | 22222202222222222221 |
| 19 | 220222222222222222229 |
| 20 | 2202222222222222222229 |