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 | 10010101 |
| 2 | 11171777 |
| 3 | 11177717 |
| 4 | 11313331 |
| 5 | 11333131 |
| 6 | 11919199 |
| 7 | 11919991 |
| 8 | 13111333 |
| 9 | 13131133 |
| 10 | 13131331 |
| 11 | 13133311 |
| 12 | 13311313 |
| 13 | 14441411 |
| 14 | 16166611 |
| 15 | 16616161 |
| 16 | 17111777 |
| 17 | 17171177 |
| 18 | 17171771 |
| 19 | 17177117 |
| 20 | 17711717 |
| 21 | 17717171 |