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 | 23 |
| 2 | 23223323 |
| 3 | 32323223 |
| 4 | 2222323333 |
| 5 | 2223223333 |
| 6 | 2232223333 |
| 7 | 2232322333 |
| 8 | 2232332233 |
| 9 | 2323222333 |
| 10 | 2332322233 |
| 11 | 2333222323 |
| 12 | 2333223223 |
| 13 | 3223232323 |
| 14 | 3232222333 |
| 15 | 3232232233 |
| 16 | 3232233223 |
| 17 | 3232322323 |
| 18 | 3323232223 |
| 19 | 22222232333333 |
| 20 | 22222322333333 |
| 21 | 22222323233333 |