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 | 0 |
| 2 | 1 |
| 3 | 10 |
| 4 | 20 |
| 5 | 102 |
| 6 | 103 |
| 7 | 203 |
| 8 | 1023 |
| 9 | 1024 |
| 10 | 1034 |
| 11 | 2034 |
| 12 | 10234 |
| 13 | 10235 |
| 14 | 10245 |
| 15 | 10345 |
| 16 | 20345 |
| 17 | 102345 |
| 18 | 102346 |
| 19 | 102356 |
| 20 | 102456 |
| 21 | 103456 |
| 22 | 203456 |
| 23 | 1023456 |
| 24 | 1023457 |
| 25 | 1023467 |
| 26 | 1023567 |
| 27 | 1024567 |
| 28 | 1034567 |
| 29 | 2034567 |
| 30 | 10234567 |
| 31 | 10234568 |
| 32 | 10234578 |
| 33 | 10234678 |