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 | 1210 |
| 2 | 2020 |
| 3 | 21200 |
| 4 | 3211000 |
| 5 | 42101000 |
| 6 | 521001000 |
| 7 | 6210001000 |
| 8 | 72100001000 |
| 9 | 821000001000 |
| 10 | 9210000001000 |