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 | 3 |
| 2 | 11 |
| 3 | 13 |
| 4 | 31 |
| 5 | 113 |
| 6 | 131 |
| 7 | 311 |
| 8 | 313 |
| 9 | 331 |
| 10 | 3313 |
| 11 | 3331 |
| 12 | 11113 |
| 13 | 11131 |
| 14 | 11311 |
| 15 | 13313 |
| 16 | 13331 |
| 17 | 31333 |
| 18 | 33113 |
| 19 | 33311 |
| 20 | 33331 |
| 21 | 113111 |
| 22 | 113131 |
| 23 | 131111 |
| 24 | 131113 |
| 25 | 131311 |
| 26 | 311111 |
| 27 | 313133 |
| 28 | 313331 |
| 29 | 313333 |
| 30 | 331333 |
| 31 | 333131 |
| 32 | 333331 |
| 33 | 1111333 |
| 34 | 1131113 |
| 35 | 1131131 |
| 36 | 1131133 |
| 37 | 1131331 |