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 | 9801 |
| 2 | 98901 |
| 3 | 989901 |
| 4 | 9899901 |
| 5 | 98019801 |
| 6 | 98999901 |
| 7 | 980109801 |
| 8 | 989999901 |
| 9 | 9801009801 |
| 10 | 9890198901 |
| 11 | 9899999901 |
| 12 | 98010009801 |
| 13 | 98901098901 |
| 14 | 98999999901 |
| 15 | 980100009801 |
| 16 | 980198019801 |
| 17 | 989010098901 |
| 18 | 989901989901 |
| 19 | 989999999901 |
| 20 | 9801000009801 |
| 21 | 9801989019801 |
| 22 | 9890100098901 |