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 | 0 |
| 1 | 10 |
| 2 | 102 |
| 3 | 120 |
| 4 | 201 |
| 5 | 1020 |
| 6 | 1200 |
| 7 | 2012 |
| 8 | 10200 |
| 9 | 12000 |
| 10 | 12320 |
| 11 | 20120 |
| 12 | 32120 |
| 13 | 102000 |
| 14 | 120000 |
| 15 | 123204 |
| 16 | 321204 |
| 17 | 1024023 |
| 18 | 1200003 |
| 19 | 1232042 |
| 20 | 1444023 |
| 21 | 2220001 |
| 22 | 3212041 |
| 23 | 10240232 |
| 24 | 12000032 |
| 25 | 12320424 |
| 26 | 14440232 |
| 27 | 32125240 |
| 28 | 50165432 |