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 | 139119131 |
| 1 | 193113191 |
| 2 | 319339313 |
| 3 | 391331393 |
| 4 | 913993919 |
| 5 | 931991939 |
| 6 | 1319999199391 |
| 7 | 1913333133931 |
| 8 | 3139999399193 |
| 9 | 3931111311913 |
| 10 | 9193333933139 |
| 11 | 9391111911319 |
| 12 | 11333911193113 |
| 13 | 11999311139119 |
| 14 | 33111933391331 |