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) |
|---|---|
| 2 | 13 |
| 3 | 113 |
| 4 | 1223 |
| 5 | 11149 |
| 6 | 111119 |
| 7 | 1111339 |
| 8 | 11111117 |
| 9 | 111111199 |
| 10 | 1111111999 |
| 11 | 11111111113 |
| 12 | 111111111149 |
| 13 | 1111111111267 |
| 14 | 11111111111257 |
| 15 | 111111111113447 |
| 16 | 1111111111112227 |
| 17 | 11111111111122223 |
| 18 | 111111111111113569 |
| 19 | 1111111111111113779 |
| 20 | 11111111111111133677 |
| 21 | 111111111111111111157 |
| 22 | 1111111111111111122359 |
| 23 | 11111111111111111133469 |