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 | 1 |
| 2 | 21 |
| 3 | 101 |
| 4 | 121 |
| 5 | 1101 |
| 6 | 1121 |
| 7 | 21121 |
| 8 | 101121 |
| 9 | 121121 |
| 10 | 1101121 |
| 11 | 1121121 |
| 12 | 21121121 |
| 13 | 101121121 |
| 14 | 121121121 |
| 15 | 1101121121 |
| 16 | 1121121121 |
| 17 | 21121121121 |
| 18 | 121121121121 |
| 19 | 1101121121121 |
| 20 | 1121121121121 |
| 21 | 21121121121121 |
| 22 | 101121121121121 |
| 23 | 121121121121121 |
| 24 | 1101121121121121 |