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 | 1 |
| 1 | 20 |
| 2 | 2100 |
| 3 | 212000 |
| 4 | 210110000 |
| 5 | 21202200000 |
| 6 | 21200101000000 |
| 7 | 21011002020000000 |
| 8 | 2120220212100000000 |
| 9 | 2120012010112000000000 |
| 10 | 2101102110221110000000000 |
| 11 | 212211101110122200000000000 |
| 12 | 212001222211110201000000000000 |
| 13 | 210112102201222221020000000000000 |