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 | 2 |
| 1 | 13 |
| 2 | 23 |
| 3 | 113 |
| 4 | 137 |
| 5 | 373 |
| 6 | 1973 |
| 7 | 1733 |
| 8 | 1373 |
| 9 | 10337 |
| 10 | 10313 |
| 11 | 31379 |
| 12 | 37337 |
| 13 | 113173 |
| 14 | 211373 |
| 15 | 313739 |
| 16 | 337397 |
| 17 | 1113173 |
| 18 | 1003733 |
| 19 | 2313797 |
| 20 | 2337397 |
| 21 | 10003733 |
| 22 | 11031373 |
| 23 | 11373379 |
| 24 | 33133733 |
| 25 | 20037337 |
| 26 | 100037339 |
| 27 | 103137337 |