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 | 1 |
| 1 | 2 |
| 2 | 13 |
| 3 | 23 |
| 4 | 113 |
| 5 | 137 |
| 6 | 373 |
| 7 | 1137 |
| 8 | 1733 |
| 9 | 1373 |
| 10 | 11317 |
| 11 | 11373 |
| 12 | 13733 |
| 13 | 31373 |
| 14 | 113173 |
| 15 | 131373 |
| 16 | 137337 |
| 17 | 337397 |
| 18 | 1113173 |
| 19 | 1137337 |
| 20 | 1373373 |
| 21 | 2337397 |
| 22 | 3733797 |
| 23 | 11373137 |
| 24 | 11373379 |
| 25 | 13733797 |
| 26 | 37337397 |
| 27 | 111373379 |
| 28 | 123733739 |