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 | 1 |
| 2 | 2 |
| 3 | 10 |
| 4 | 20 |
| 5 | 102 |
| 6 | 122 |
| 7 | 201 |
| 8 | 210 |
| 9 | 211 |
| 10 | 212 |
| 11 | 1000 |
| 12 | 1011 |
| 13 | 1020 |
| 14 | 1021 |
| 15 | 1022 |
| 16 | 1121 |
| 17 | 1200 |
| 18 | 1211 |
| 19 | 1220 |
| 20 | 2000 |
| 21 | 2001 |
| 22 | 2010 |
| 23 | 2011 |
| 24 | 2012 |
| 25 | 2021 |
| 26 | 2022 |
| 27 | 2100 |
| 28 | 2110 |
| 29 | 2120 |
| 30 | 2201 |
| 31 | 2210 |
| 32 | 10002 |
| 33 | 10012 |
| 34 | 10020 |
| 35 | 10021 |
| 36 | 10022 |
| 37 | 10102 |
| 38 | 10122 |
| 39 | 10200 |
| 40 | 10210 |
| 41 | 10211 |