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 | 112121 |
| 2 | 113131 |
| 3 | 115151 |
| 4 | 119191 |
| 5 | 127271 |
| 6 | 131311 |
| 7 | 134341 |
| 8 | 136361 |
| 9 | 140401 |
| 10 | 142421 |
| 11 | 145451 |
| 12 | 149491 |
| 13 | 157571 |
| 14 | 158581 |
| 15 | 161611 |
| 16 | 169691 |
| 17 | 170701 |
| 18 | 172721 |
| 19 | 178781 |
| 20 | 182821 |
| 21 | 187871 |
| 22 | 190901 |
| 23 | 191911 |
| 24 | 196961 |
| 25 | 197971 |
| 26 | 1100010001 |
| 27 | 1100210021 |
| 28 | 1101710171 |