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 | 100 |
| 3 | 1020 |
| 4 | 10230 |
| 5 | 102340 |
| 6 | 1023450 |
| 7 | 10234560 |
| 8 | 102345670 |
| 9 | 1023456780 |
| 10 | 10234567889 |